The expression that is equivalent to (4 - 2x)(4 + 2x) is equal to 16 - 4x^2 approximately.
To simplify the expression (4 - 2x)(4 + 2x), we can use the FOIL method, which stands for First, Outer, Inner, Last. This method involves multiplying each term in the first factor by each term in the second factor and then combining like terms.
Using the FOIL method, we get:
(4 - 2x)(4 + 2x) = 4 × 4 + 4 × 2x - 2x × 4 - 2x × 2x
Simplifying the expression, we get:
16 + 8x - 8x - 4x^2
The two middle terms cancel each other out, leaving us with:
16 - 4x^2
We can also check our answer by factoring the simplified expression back to the original expression. If we factor 16 - 4x^2, we get:
16 - 4x^2 = 4(4 - x^2)
We can then use the difference of squares formula, which states that a^2 - b^2 = (a + b)(a - b), to factor further:
4(4 - x^2) = 4(2 + x)(2 - x)
This gives us back the original expression, (4 - 2x)(4 + 2x), confirming that 16 - 4x^2 is equivalent to (4 - 2x)(4 + 2x).
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5 2 fiths minus 1 2 fiths
Answer:
Step-by-step explanation:
2/5-1 2/5
an inner city revitalization zone is a rectangle that is twice as long as it is wide. the width of the region is growing at a rate of 32 m per year at a time when the region is 220 m wide. how fast is the area changing at that point in time?
The area is changing at a rate of 28,160 m²/year at that point in time.
The area of the rectangular region is given by:
A = lw
Where l is the length of the rectangular region and w is the width of the rectangular region.
The width of the rectangular region is given to be 220 m. Therefore, we have the width w = 220 m. The length l of the rectangular region can be found knowing that it is twice as long as it is wide. Therefore, the length of the rectangular region is given by:
l = 2w
l = 2 x 220
l = 440
Therefore, the length l of the rectangular region is 440 m.
At the given point in time, the width of the rectangular region is growing at a rate of 32 m per year. Therefore, we have the rate of change of the width dw/dt to be 32 m per year. We need to find how fast the area of the rectangular region is changing at that point in time. Therefore, we need to find the rate of change of the area of the rectangular region dA/dt.
A = lw
dA/dt = w dl/dt + l dw/dt
dA/dt = 220 d/dt(2w) + 440 dw/dt
dA/dt = 220 x 2 dw/dt + 440 dw/dt
dA/dt = 880 dw/dt
Substitute the value of dw/dt to get:
dA/dt = 880 x 32
dA/dt = 28,160 m²/year
Therefore, the area of the rectangular region has a rate of change of 28,160 m² per year at that point in time.
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Someone please help I need the answer to the 7 questions the image is below
a) The Name of the angle of elevation is ∠c = 83.3°
b) The Name of the Hypotenuse side is AC
c) The Name of the Opposite side is AB
What is the elevation angle?The angle formed between the line of sight and the horizontal is known as the angle of elevation. The angle created is an angle of elevation if the line of sight is upward from the horizontal line.
We can use the tangent ratio to determine the angle of elevation:
tan(angle of elevation) = opposite/adjacent
tan(angle of elevation) = 29.25/4.75
tan(angle of elevation) = 6.157
The inverse tangent (tan⁻¹) both sides, we obtain:
angle of elevation = tan⁻¹(6.157)
Using a calculator, we get:
angle of elevation ≈ 81.3 degrees (rounded to the nearest tenth)
The elevation angle is roughly 81.3 degrees.
d) The Name of the Adjacent side is BC
e) The Trig Ratio I will be using is Tan θ = Sin θ/Cos θ because we are
given the side Opposite Side & Adjacent Side
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PLS ANSWER THIS ASAP
In two similar triangles, the ratio of the lengths of a pair of corresponding sides is 7:8. If the perimeter of the larger triangle is 32, find the perimeter of the smaller triangle.
The perimeter of the smaller triangle would be = 28.1
How to calculate the perimeter of the smaller triangle?A triangle can be defined as a three sided polygon that has a total internal angle of 180°.
To calculate the perimeter of the triangle is to find out the scale factor that exists between the two triangles.
The formula for scale factor = original object/new object
Scale factor= 8/7 = 1.14
The perimeter of the smaller triangle = 32/1.14
= 28.1.
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what is the vertex of h=-16t^2+29t+6 and its domain and range, and x and y axis?
there was a person trolling and didnt actually answer i need the answer to this
Answer:
Step-by-step explanation:
To write 0.246 as a fraction in simplest form, we need to remove the decimal and reduce the fraction to its lowest terms.
Step 1: Write 0.246 as the fraction 246/1000.
(Note: We get the denominator 1000 by counting the number of decimal places after the 6 in 0.246.)
Step 2: Simplify the fraction by dividing both the numerator and denominator by the greatest common factor.
The greatest common factor (GCF) of 246 and 1000 is 2.
246/2 = 123
1000/2 = 500
Therefore, 0.246 written as a fraction in simplest form is 123/500.
Answer:if I’m correct I think you would put it like this 123/500
It can’t be reduced because the denominator is at it’s simplest form
Step-by-step explanation:
a child who weighs 18kg is to receive motrin (ibuprofen) 8mg/kg by mouth every 4 hours as needed for pain. the label reads 100mg/5mls. how many milliliters will you administer?
According to the information on what the child should receive ibuprofen, it should be administered to the child 1.6 mL.
What is Ibuprofen?Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID). It works by inhibiting the body's synthesis of prostaglandins. This aids in the reduction of swelling, pain, and fever. It can also be used to relieve mild to moderate pain caused by menstruation, arthritis, or toothache.
To calculate the amount of milliliters to be administered, we need to use the following formula:
Amount of Motrin = Weight of child (kg) × Dose of Motrin (mg/kg) ÷ Concentration of Motrin (mg/ml)
Where
Weight of child = 18kgDose of Motrin = 8mg/kgConcentration of Motrin = 100mg/5mlsSubstitute the given values in the above formula.
Amount of Motrin = 18kg × 8mg/kg ÷ 100mg/5mls= 144mg ÷ 20mg/mls= 7.2mls
Therefore, the amount of Motrin to be administered is 7.2mls.
However, the dosage amount administered is not in 5ml increments. Therefore, we need to round it to one decimal place. Thus, we'll have: Amount of Motrin = 7.2 ml (rounded to one decimal place) = 1.6 ml Answer: 1.6 ml
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Lee buys 12 notebooks for 1. 29 each. How much money does lee spend on the 12 notebooks
Lee buys 12 notebooks and the cost of each one is $1.29. The total cost of all twenty notebooks is equals to $15.48. So, Total $15.48, money lee spends on the 12 notebooks.
We have, Lee buys some notebooks by spending money.
Number of notebooks that she bought = 12
The price or cost of one notebook = $1.29
We have to determine the amount of money she spends on the 12 notebooks, that total cost of 12 notebooks. Let the total cost of 12 notebooks be 'x dollars'. As we know , total cost is equals to multiplcation of number of objects by cost of one object. So, total cost of 12 notebooks = number of notebooks × cost of one notebook
=> total cost of 12 notebooks = 12 ×1.29
= (12×129)/100
= 15.48
Hence, the required cost is $15.48.
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Complete question:
Lee buys 12 notebooks for $1.29 each. How much money does lee spend on the 12 notebooks.
Mr. Ferrell has feet of a piece of 5/6 cardboard. He wants to cut pieces that are foot long. 1/8 How many pieces can he make?
Mr. Ferrell can cut 6 and 2/3 pieces that are one-eighth foot long from a 5/6 foot long piece of cardboard.
What is common factor?A number is said to be a common factor if it can divide two or more integers without producing a residue. Common factors are used in fraction operations to simplify fractions and carry out operations like addition, subtraction, multiplication, and division.
Finding a common denominator is necessary, for instance, when adding or subtracting fractions. A multiple of all the fractions' denominators is referred to as a common denominator. We can determine the shared characteristics of the denominators and utilise the lowest common multiple (LCM) as the common denominator to obtain a common denominator.
Given that, one-eighth foot long pieces can be cut from a 5/6 foot long piece of cardboard.
First, we need to convert 5/6 feet into eighths of a foot:
5/6 feet = (5/6) * 8 eighths = 40/48 eighths
Next, we need to divide 40/48 by 1/8 to find the number of one-eighth foot long pieces that can be cut:
(40/48) ÷ (1/8) = (40/48) * (8/1) = 320/48 = 6 2/3 pieces
Hence, Mr. Ferrell can cut 6 and 2/3 pieces that are one-eighth foot long from a 5/6 foot long piece of cardboard.
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Use Lagrange multipliers to find the points on the given cone that are closest to the following point.
z^2 = x^2 + y^2; (14, 8, 0)
x,y,z=(smaller z-value)
x,y,z=(larger z-value)
By using the Lagrange multipliers, the two points on the cone that is closest to (14, 8, 0) are:
(7, 4, √65) and (7, 4, -√65)
We want to minimize the distance between the point (14, 8, 0) and the points on the cone z^2 = x^2 + y^2. The distance squared between two points (x_1, y_1, z_1) and (x_2, y_2, z_2) is given by:
d^2 = (x2 - x1)^2 + (y2 - y1)^2 + (z2 - z1)^2
In our case, we want to minimize the distance squared between (14, 8, 0) and a point (x, y, z) on the cone z^2 = x^2 + y^2:
d^2 = (x - 14)^2 + (y - 8)^2 + z^2
Subject to the constraint z^2 = x^2 + y^2. We can use Lagrange multipliers to solve this constrained optimization problem. Let L be the Lagrangian:
L = (x - 14)^2 + (y - 8)^2 + z^2 - λ(z^2 - x^2 - y^2)
Taking the partial derivatives of L with respect to x, y, z, and λ, and setting them to zero, we get:
2(x - 14) - 2λx = 0.....(1)
2(y - 8) - 2λy = 0.....(2)
2z - 2λz = 0.....(3)
z^2 - x^2 - y^2 = 0.....(4)
Simplifying the third equation, we get z(1 - λ) = 0. Since we want to find points where z is not zero, we must have λ = 1. Then, from the first two equations, we get x = 7 and y = 4. Substituting these values into the fourth equation, we get:
z^2 = x^2 + y^2 = 65
So the two points on the cone that is closest to (14, 8, 0) by using Lagrange multipliers are:
(7, 4, √65) and (7, 4, -√65)
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Which value will be assigned to z in line 12 under static sexping? (b) Which value will be assigned to 2 in line 12 under dynamic scoping? I might be instructive to draw the runtime stack for different times of the execution. Inut it is not strictly required. Draw the runtime stack after each line executes! Exercise 3. Parameter Passing Consider the following block. Ansune static scaping { int y: int z; - 7 { int (int a) 4 yari: return (yta) 1 int g(int x) { y = f(x+1)+1; 2:- 1( x3): return (z+1) } 2 :- g(y2): : 12 13 14 is) What are the values of y and 2 at the end of the following block under the assumption that both parameters a und x repassed: la) Call-by-Name (h) Calltyy Need It might be instructive to draw the runtime stack for differcut times of the execution, but it is not strictly required Draw the runtime stack after each line executes
The runtime stack for dynamic scoping at the end of the block would be:
Under static scoping, the value of z in line 12 will be 7. Under dynamic scoping, the value of z in line 12 will be the value of y in line 2, which is equal to f(x+1)+1. The values of y and z in the end of the block will differ depending on the parameter passing method used.
For call-by-name, the value of y at the end of the block will be f(x+1)+1 and the value of z will be f(x+1)+1+1. For call-by-need, the value of y will be f(x+1)+1 and the value of z will be f(x+1)+1+1.
It might be instructive to draw the runtime stack for different times of the execution, but it is not strictly required. The runtime stack for static scoping at the end of the block would be:
The runtime stack for dynamic scoping at the end of the block would be:
The equation y = 1.55x + 110,419 approximates the total cost, in dollars, of raising a child in the united states from birth to 17 years, given the household’s annual income, x.
What is the approximate total cost of raising a child from birth to 17 years in a household with an annual income of 80,321
Answer:
he cost to raise a child from birth to 17 years in a household is $194119.
Step-by-step explanation:
Important information:
The equation y = 1.55x + 110,419
The annual incoem is $54,000
Calculation of the cost:
y = 1.55(54,000) + 110419
y = 83700 + 110419
y = $194119
a hummingbird lives in a nest that is 5 meters high in a tree. the hummingbird flies 9 meters to get from its nest to a flower on the ground. how far is the flower from the base of the tree? if necessary, round to the nearest tenth.
The flower is about 10.3 meters away from the base of the tree, rounded to the nearest tenth of a meter. The hummingbird has to fly this distance to get to the flower.
To figure out how far the flower is from the base of the tree, we need to use the Pythagorean theorem. It can be applied when there is a right triangle, which is a triangle with one angle of 90 degrees.Here, the hummingbird's nest is at the top of the tree, and the flower is on the ground. The vertical distance from the nest to the ground is 5 meters. The horizontal distance from the tree trunk to the flower is the distance we want to find.
We'll need to calculate the length of the hypotenuse (the slanted line) of the right triangle in order to determine the distance from the tree to the flower. The hypotenuse's length is found by squaring each of the other sides, adding the results together, and then taking the square root:
hypotenuse=√5^2+9^2
=√25+81 = √106
≈10.3 m
So the flower is about 10.3 meters away from the base of the tree, rounded to the nearest tenth of a meter. The hummingbird has to fly this distance to get to the flower.
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The first term of a sequence along with a recursion formula for the remaining terms is given below. Write out the first ten terms of the sequence.a1=6,an+1=an+(1/3^n)
The first term of the given sequence is 6, and the recursion formula for the remaining terms is 6, 6.333, 6.444, 6.481, 6.4938, 6.4988, 6.5007, 6.5018, 6.5024, 6.5026.
We are given a recursive formula: [tex]a_{n+1} = an + (1/3^n)[/tex] with [tex]a_{1} = 6.[/tex]
Using this formula, we can calculate the first few terms of the sequence as follows:
[tex]a_{1}= 6[/tex]
[tex]a_{2} = a_{1} + (1/3^1) = 6 + 1/3 = 6.333[/tex]
[tex]a_{3} = a_{2} + (1/3^2) = 6.333 + 1/9 = 6.444[/tex]
[tex]a_{4} = a_{3} + (1/3^3) = 6.444 + 1/27 = 6.481[/tex]
[tex]a_{5} = a_{4} + (1/3^4) = 6.481 + 1/81 = 6.4938[/tex]
[tex]a_{6} = a_{5} + (1/3^5) = 6.4938 + 1/243 = 6.4988[/tex]
[tex]a_{7} = a_{6} + (1/3^6) = 6.4988 + 1/729 = 6.5007[/tex]
[tex]a_{8} = a_{7} + (1/3^7) = 6.5007 + 1/2187 = 6.5018[/tex]
[tex]a_{9} = a_{8} + (1/3^8) = 6.5018 + 1/6561 = 6.5024[/tex]
[tex]a_{10} = a_{9} + (1/3^9) = 6.5024 + 1/19683 = 6.5026[/tex]
Therefore, the first 10 terms of the sequence are: 6, 6.333, 6.444, 6.481, 6.4938, 6.4988, 6.5007, 6.5018, 6.5024, 6.5026.
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if the length of a rectangle is decreased by 4 cm and the width is increased by 5 cm, the result will be a square. the area of this square will be 40cm^2 greater than the area of the rectangle. Find the area of the rectangle.
Answer: 30 cm^2.
Step-by-step explanation:
Let the original length of the rectangle be l and its width be w. Then, according to the problem:
(l - 4) = (w + 5) (equation 1)
Also, the area of the square is 40 cm^2 more than the area of the rectangle. Mathematically, we can represent this as:
(l - 4 + 5)^2 = lw + 40
Simplifying the left-hand side and substituting equation 1, we get:
l^2 - 2lw + w^2 = lw + 40
l^2 - 3lw + w^2 - 40 = 0
(l - 8)(l - 5) = 0
Therefore, l = 8 or l = 5. If we substitute l = 8 into equation 1, we get:
w = (l - 4) - 5 = -1
This is not a valid solution since the width cannot be negative. Therefore, the only valid solution is l = 5, which gives:
w = (l - 4) + 5 = 6
So the area of the rectangle is:
A = lw = 5 x 6 = 30 cm^2.
Answer:
steps explanations: x - 4 = y + 5 (sides of a square)
(x - 4)(y + 5) = 40
Which gives;
(y + 5) (y + 5) = 40
y² + 10y + 25 = 40
y² + 10y + 25 - 40 = 0
y² + 10y - 15 = 0
a=1 b=10 and c=-15
Bernard's rectangular bedroom is 12 feet by 16 feet. What is the diagonal distance from one corner to the opposite corner?
Answer: 20 feet
Step-by-step explanation: To find the diagonal distance from one corner to the opposite corner of Bernard's rectangular bedroom, we can use the Pythagorean theorem, which states that the square of the length of the hypotenuse (diagonal) of a right triangle is equal to the sum of the squares of the lengths of the other two sides.
In this case, the two other sides are the length and the width of the room, so we have:
diagonal^2 = 12^2 + 16^2
diagonal^2 = 144 + 256
diagonal^2 = 400
Taking the square root of both sides, we get:
diagonal = √400
diagonal = 20 feet
Therefore, the diagonal distance from one corner to the opposite corner of Bernard's rectangular bedroom is 20 feet.
Can you help me with this?
16. The equatiοn οf the line in slοpe-intercept fοrm that passes thrοugh the pοint (-6, 5) and is parallel tο x + 2y = 14 is y = (-1/2)x + 2.
What is equatiοn οf line?The equatiοn οf a straight line is y = mx + c, y = m x + c m is the gradient and c is the height at which the line crοsses the y -axis, alsο knοwn as the y -intercept.
16. Tο write the equatiοn οf a line in slοpe-intercept fοrm, we need tο find the slοpe and the y-intercept οf the line.
Tο find the slοpe οf the line, we can rewrite the equatiοn x + 2y = 14 in slοpe-intercept fοrm y = mx + b by sοlving fοr y:
x + 2y = 14
2y = -x + 14
y = (-1/2)x + 7
The slοpe οf the line is -1/2.
Since the line we want tο find is parallel tο this line, it will have the same slοpe οf -1/2.
Nοw we can use the pοint-slοpe fοrm οf the equatiοn οf a line tο find the equatiοn οf the line that passes thrοugh the pοint (-6, 5) with a slοpe οf -1/2:
y - y1 = m(x - x1)
where (x1, y1) is the pοint (-6, 5), and m is the slοpe, -1/2.
y - 5 = (-1/2)(x - (-6))
y - 5 = (-1/2)x - 3
y = (-1/2)x + 2
17. The equation perpendicular to y = -(2/3)x + 4, passing through (-4, 6)
perpendicular equations slope would be negative reciprocal to the current line.
The slope in y = -(2/3)x + 4, is m = -(2/3),
The negative reciprocal of -(2/3) is 3/2
Now, applying the x and y values in pοint-slοpe fοrm
y - 6 = 3/2(x - (-4))
y = 3/2(x+4) + 6
y = (3/2)x + 6 + 6
y = (3/2)x + 12
18. Since the line we want tο find is parallel tο this line, it will have the same slοpe.
Lets find the slope using slope formula
[tex]\rm m = \dfrac{y_2 - y_1}{x_2 - x_1}[/tex]
[tex]\rm m = \dfrac{0 - (-1)}{2 - (-1)}[/tex]
[tex]\rm m = \dfrac{1}{3}[/tex]
Now, using the point slope form
y - 1 = 1/3(x - 3)
y = 1/3(x - 3) + 1
y = (1/3)x - 1 + 1
y = (1/3)x
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Find a vector equation and parametric equations in tfor the line through the point and parallel to the given line.(P0 corresponds to t = 0.)
P0 = (0,12, -10)
x = -4 + 2t, y = 7 - 4t, z = 5 + 8t
How do you find x,y,and z?
The vector equation and the parametric equations in t for the line through the point and parallel to the given line are:
Vector Equation= [-4 7 5] + t[2 -4 8]Parametric Equations:x= 2t - 4
y= -4t + 7
z= 8t + 5
How to find the value of x, y, and zTo find x, y, and z in the given scenario, the following steps can be followed:
1: Vector Equation of Line
To find the vector equation, use the given line and its coefficients:
x = -4 + 2t
y = 7 - 4t
z = 5 + 8t
Take the coefficients of x, y, and z, and place them in a 3 by 1 matrix:
Column Matrix= [-4 7 5]
Add the parameter t and place it in a column matrix to get the vector equation:
Vector Equation= [-4 7 5] + t[2 -4 8]
2: Parametric Equation.
To find the parametric equations, write the components of the vector equation in terms of the parameters:
x= -4 + 2t
y= 7 - 4t
z= 5 + 8t
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use the newton-raphson method to find an approximate value of 3√7 . use the method until successive approximations obtained by calculator are identical. an appropriate function to use for the approximation would be f (x) = A x^2 + B x^3 + C x + D where A= B= C= D=
If c1 = 2, then c2 = ___
2√3= ____
4. Circle the reason for each of the following manipulations used to simplify the product (8x²)(3x²).
(8.3).(x²-x²)
8x²-3x²
commutative or associative
8.3.x²-x²
commutative or associative
24x²
commutative or exponent property
8.3.x².x² = (8.3).(x².x²) - commutative and associative properties of multiplication.
What is commutative law?Commutative laws deal with arithmetic operations addition and multiplication. This means that changing the order or position when adding or multiplying two numbers does not change the final result. For example, 4 + 5 is 9 and 5 + 4 is also 9. The order in which the two numbers are added does not affect the sum. The same concept applies to multiplication. Commutativity does not apply to subtraction and division, because changing the order of the numbers yields a completely different final result.
(8x²)(3x²) can be simplified as follows:
(8x²)(3x²) = 8.3.x².x² = (8.3).(x².x²)
= [tex]24x^4[/tex]
The reason for each of the manipulations is as follows:
8.3.x².x² = (8.3).(x².x²) - commutative and associative properties of multiplication.
(8.3).(x².x²) = [tex]24x^4[/tex] - exponent property of multiplication.
Therefore, the final answer is [tex]24x^4[/tex].
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Martin makes b bags of snack mix. Each bag contains 1.5 lb of nuts and 0.75 lb of dried fruit. What does the expression 1.5b + 0.75b represent?
Pls explain why
1.5b + 0.75b represents the total amount of nuts and dried fruit used for b bags of snack mix.
b is the number of bags of snack mix, so the expression 1.5b means 1.5 multiplied by b, which is the total amount of nuts used for b bags of snack mix. Similarly, 0.75b is 0.75 multiplied by b, which is the total amount of dried fruit used for b bags of snack mix.
Adding these together gives us 1.5b + 0.75b, which is the total amount of nuts and dried fruit used for b bags of snack mix.
A series of locks manages the water height along a water source used to produce energy. As the locks are opened and closed, the water height between two consecutive locks fluctuates.
The height of the water at point B located between two locks is observed. Water height measurements are made every 10 minutes beginning at 8:00 a.m.
It is determined that the height of the water at B can be modeled by the function f(x)=−11cos(πx/48 − 5π/12)+28 , where the height of water is measured in feet and x is measured in minutes.
What is the maximum and minimum water height at B, and when do these heights first occur?
The given function f(x) = -11cos(πx/48 - 5π/12) + 28 models the height of water at point B between two locks, where x is the time in minutes beginning at 8:00 a.m.
The amplitude of the cosine function is 11, and the vertical shift is 28. The argument of the cosine function has a period of 96 minutes, which means that the function repeats itself every 96 minutes.
Therefore, the maximum water height at B is 39 feet and occurs at x = 120 minutes (10:00 a.m.), while the minimum water height at B is 17 feet and occurs at x = 0 minutes (8:00 a.m.). These heights occur because the cosine function attains its maximum value at x = 120 minutes and its minimum value at x = 0 minutes.
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Jamal sold hotdogs at a recent basketball game. Each hotdog sold for $3.50. In total, Jam
sold $98 worth of hot dogs. Let n be the number of hotdogs that Jamal sold.
Set up an equation that models the information given in this problem.
Answer:The concession stand sold
46
hot dogs and
32
hamburgers.
Explanation:
The first thing to do in algebraic problems is assign variables to things we don't know, so let's start there:
We don't know how many hot dogs the concession stand sold, so we will call that number
d
.
We don't know how many hamburgers the concession stand sold, so we will call that number
h
.
Now we translate the statements into algebraic equations:
The number of hot dogs and hamburgers that were sold is
78
, so
d
+
h
=
78
.
If each hot dog is sold for
1.25
, then the total revenue from hot dogs is given by
1.25
d
. In the same way, the total revenue from hamburgers is
1.50
h
. The total revenue from both hot dogs and hamburgers should be the sum of these, and since we are told the total revenue is
105.50
, we can say
1.25
d
+
1.5
h
=
105.5
.
We now have a system of two linear equations:
d
+
h
=
78
1.25
d
+
1.5
h
=
105.5
We can solve it using several methods, though I'm going to go with substitution. Use the first equation to solve for
d
:
d
+
h
=
78
→
d
=
78
−
h
Now plug this in for
d
in the second equation:
1.25
d
+
1.5
h
=
105.5
→
1.25
(
78
−
h
)
+
1.5
h
=
105.5
Solving for
h
, we have:
97.5
−
1.25
h
+
1.5
h
=
105.5
0.25
h
=
8
h
=
8
.25
→
h
=
32
Since
h
+
d
=
78
,
32
+
d
=
78
→
d
=
46
Step-by-step explanation:
Are the expressions -0.5(3x + 5) and
-1.5x + 2.5 equivalent? Explain why or why not.
These expression is not true .
What is a mathematical expression?
A mathematical expression is a sentence that consists of at least two numbers or variables, the expression itself, at least one arithmetic operation, and the expression itself. Any one of the following mathematical operations could be used: addition, subtraction, multiplication, or division.
For instance, the expression x + y is an expression with the addition operator placed between the terms x and y. Mathematicians utilize two different sorts of expressions: algebraic and numeric. Numeric expressions only contain numbers; algebraic expressions additionally incorporate variables.
-0.5(3x + 5) and -1.5x + 2.5 equivalent.
by distributing the 0.5 = -1.5x + 2.5
= -1.5x + 2.5
= 0.5(3*2 + 5 )
= - 1.5 * 2 + 2.5
= - 3 - 2.5 = -3 + 2.5
- 5. 5 = 0.5
this is not true. these expression is not true .
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Write a equation for a parabola with a focus at (-2,5) and a directrix at x=3 format: x=
Answer:Write a equation for a parabola with a focus at (-2,5) and a directrix at x=3 format: x=
Step-by-step explanation:
Solve each of the following systems by the Method of Elimination. These two should be relatively easy. Make sure to understand why. (a) x-y 7 (b) 2x+5y = 3 x+ y=5 -2x-y= 5
A) The solution of the system x-y = 7, x+y = 5 is (6, -1)
B) The solution of the system 2x+5y = 3, -2x-y= 5 is (-16/3, 13/3)
A) To solve by the elimination method , we add the left-hand sides and right-hand sides of the two equations separately, as follows,
(x - y) + (x + y) = 7 + 5
2x = 12
x = 6
(x + y) - (x - y) = 5 - 7
2y = -2
y = -1
Therefore, the solution to the system is (x, y) = (6, -1).
B) To solve by the method of elimination, we can multiply the first equation by 2 to eliminate the x term, as follows,
2x + 5y = 3
-4x - 2y = 10
Adding these two equations, we get,
3y = 13
y = 13/3
Substituting y = 13/3 into the first equation, we get,
2x + 5(13/3) = 3
2x = -32/3
x = -16/3
Therefore, the solution to the system is (x, y) = (-16/3, 13/3)
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The given question is incomplete, the complete question is:
Solve each of the following systems by the Method of Elimination A) x-y = 7, x+y = 5 B) 2x+5y = 3, -2x-y= 5
Based on the following sorted 20 values for age, what are the possible split points?
{20, 22, 24, 26, 28, 31, 32, 33, 35, 40, 42, 43, 45, 47, 49, 50, 52, 53, 55, 57}
Multiple Choice
a {20, 21, 23, 25, 27, 29. 5, 31. 5, 32. 5, 34, 37. 5, 41, 42. 5, 44, 46, 48, 49. 5, 51, 52, 54, 56}
b {21, 23, 25, 27, 29. 5, 31. 5, 32. 5, 34, 37. 5, 41, 42. 5, 44, 46, 48, 49, 51, 52. 5, 54, 56, 57}
c {0, 21, 23, 25, 27, 29. 5, 31. 5, 32. 5, 34, 37. 5, 41, 42. 5, 44, 46, 48, 49, 51, 52. 5, 54, 56}
d {21, 23, 25, 27, 29. 5, 31. 5, 32. 5, 34, 37. 5, 41, 42. 5, 44, 46, 48, 49. 5, 51, 52. 5, 54, 56}
Based on the following sorted 20 values for age, the possible split points are {20, 21, 23, 25, 27, 29. 5, 31. 5, 32. 5, 34, 37. 5, 41, 42. 5, 44, 46, 48, 49. 5, 51, 52, 54, 56} (option a).
Option A suggests that the split points are {20, 21, 23, 25, 27, 29.5, 31.5, 32.5, 34, 37.5, 41, 42.5, 44, 46, 48, 49.5, 51, 52, 54, 56}. Notice that every split point falls between two consecutive ages in the original list. For example, the first split point is 20 because it is between 20 and 22. The second split point is 21 because it is between 20 and 22 as well.
Option B suggests that the split points are {21, 23, 25, 27, 29.5, 31.5, 32.5, 34, 37.5, 41, 42.5, 44, 46, 48, 49, 51, 52.5, 54, 56, 57}. Notice that the only difference between this option and Option A is that the last split point is 57 instead of 49.5.
Option C suggests that the split points are {0, 21, 23, 25, 27, 29.5, 31.5, 32.5, 34, 37.5, 41, 42.5, 44, 46, 48, 49, 51, 52.5, 54, 56}. Notice that the first split point is 0, which is not a possible age in the original list.
Option D suggests that the split points are {21, 23, 25, 27, 29.5, 31.5, 32.5, 34, 37.5, 41, 42.5, 44, 46, 48, 49.5, 51, 52.5, 54, 56}. Notice that the only difference between this option and Option A is that the split point after 49 is 49.5 instead of 49.5.
In summary, the correct answer is Option A because it provides all the possible split points that fall between the ages in the original list. When working with split points, it's important to consider the specific context and criteria for dividing the data.
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in the figure below, mL2= 138, find mL1, mL3, and mL4
Answer:
Step-by-step explanation:
Find ∠1:
∠2 + ∠1 = 180 (angles on a straight line are supplementary)
138 + ∠1 = 180
∠1 = 42°
Find ∠4:
∠4 =∠2 = 138° (vertically opposite angles are equal)
Find ∠3:
∠3 = ∠1 = 42° (vertically opposite angles are equal)
You and your siblings decided to make 10 pies for a bake sale. There were 8 slices in each apple pie and 10 slices in each shoo-fly pie. At the sale, there were 84 slices available. How many of each pie were made?
Answer: 6 apple pies and 4 shoo-fly pies were made.
Step-by-step explanation:
Let's assume the number of apple pies made is A, and the number of shoo-fly pies made is S.
We know that there were 8 slices in each apple pie, so the total number of apple pie slices would be 8A. Similarly, the total number of shoo-fly pie slices would be 10S.
We also know that the total number of slices available was 84. So we can write an equation:
8A + 10S = 84
We have two unknowns and only one equation, so we need another equation to solve for A and S. We know that the siblings made a total of 10 pies. So we can write another equation:
A + S = 10
Now we have two equations and two unknowns, so we can solve for A and S. We can use substitution to eliminate one variable:
A + (10 - A) = 10
10 = 2A + 10
2A = 0
A = 0
This is obviously not the solution we're looking for, so there must be an error in our calculations. Let's check our first equation:
8A + 10S = 84
If A = 0, then we have:
10S = 84
S = 8.4
This is also not a valid solution since we can't make 8.4 shoo-fly pies. The mistake we made was assuming that both A and S were whole numbers. We can fix this by using another equation:
A + S = 10
We know that A and S are both whole numbers and that A + S = 10. The only pairs of whole numbers that add up to 10 are (1, 9), (2, 8), (3, 7), (4, 6), and (5, 5).
Let's try each pair and see which one gives us a valid solution:
(1, 9): 8(1) + 10(9) = 98 (not 84)
(2, 8): 8(2) + 10(8) = 96 (not 84)
(3, 7): 8(3) + 10(7) = 94 (not 84)
(4, 6): 8(4) + 10(6) = 92 (not 84)
(5, 5): 8(5) + 10(5) = 90 (not 84)
None of the pairs work, which means there is no valid solution that uses whole numbers for A and S.
However, we can use decimals to get a solution that's close to the desired number of slices. Let's try (4.2, 5.8):
8(4.2) + 10(5.8) = 84.4 (close to 84)
This means that the siblings made 4.2 apple pies and 5.8 shoo-fly pies. Since we can't make a fraction of a pie, we'll round up the number of apple pies and round down the number of shoo-fly pies:
4 apple pies and 5 shoo-fly pies would give us a total of 8(4) + 10(5) = 84 slices, which is the desired number.
.......???????????????
Answer:
Step-by-step explanation:
[tex]x^2-5=-7x-1[/tex]
[tex]x^2+7x-5=-1[/tex] (subtracted 7x from both sides of the equation)
[tex]x^2+7x-4=0[/tex] (+1 both sides)
Use quadratic formula to solve for x:
[tex]x=\frac{-b \pm \sqrt{b^2 - 4ac} }{2a}[/tex] where [tex]a=1,b=7,c=-4[/tex]
[tex]=\frac{-7 \pm \sqrt{7^2 - 4\times1\times(-4)} }{2\times 1}[/tex]
[tex]=\frac{-7 \pm \sqrt{49 +16} }{2}[/tex]
[tex]=\frac{-7 \pm \sqrt{65} }{2}[/tex]
[tex]x=\frac{-7 +\sqrt{65} }{2},\frac{-7 - \sqrt{65} }{2}[/tex]
[tex]x=0.53,-7.53[/tex]