In a relational database, the three basic operations used to develop useful sets of data are:_________.
a. select, project, and join.
b. select, project, and where.
c. select, from, and join.
d. select, join, and where.

Answer:

(a): The value of the objective function at the corner points

[tex]Z = 10[/tex]

[tex]Z = 19[/tex]

[tex]Z = 15[/tex]

(b) The optimal solution is [tex](6,2)[/tex]

Explanation:

Given

[tex]Min\ Z = X_1 + 2X_2[/tex]

Subject to:

[tex]-2X_1 + 5X_2 \ge -2[/tex] ---- 1

[tex]X_1 + 4X_2 \le 27[/tex] ---- 2

[tex]8X_1 + 5X_2 \ge 58[/tex] --- 3

Solving (a): The value of the at the corner points

From the graph, the corner points are:

[tex](6,2)\ \ \ \ \ \ (11,4)\ \ \ \ \ \ \ \ (3,6)[/tex]

So, we have:

[tex](6,2)[/tex] ------- Corner point 1

[tex]Min\ Z = X_1 + 2X_2[/tex]

[tex]Z = 6 + 2 * 2[/tex]

[tex]Z = 6 + 4[/tex]

[tex]Z = 10[/tex]

[tex](11,4)[/tex] ------ Corner point 2

[tex]Min\ Z = X_1 + 2X_2[/tex]

[tex]Z = 11 + 2 * 4[/tex]

[tex]Z = 11 + 8[/tex]

[tex]Z = 19[/tex]

[tex](3,6)[/tex] --- Corner point 3

[tex]Min\ Z = X_1 + 2X_2[/tex]

[tex]Z = 3 + 2 * 6[/tex]

[tex]Z = 3 + 12[/tex]

[tex]Z = 15[/tex]

Solving (b): The optimal solution

Since we are to minimize Z, the optimal solution is at the corner point that gives the least value

In (a), the least value of Z is: [tex]Z = 10[/tex]

So, the optimal solution is at: corner point 1

[tex](6,2)[/tex]

Answer:

The immaterial benefits stem from the development of an information system and cannot easily be measured in dollars or with confidence. Potential intangible advantages include a competitive need, timely information, improved planning and increased flexibility in organisation.

Explanation:

Intangible advantages

Lower productivity and the lack of 'think outside' employees and managers as well as greater sales include the intangible costs of such an operational environment. All these factors improve when employees spend less of their time in addressing current methods of operation and are concerned about whether they will have a job or an employer in six months or a year. The automation level envisaged in this new system should enhance the overall efficiency of management. The operative controls and design functions should be simplified by tight system integrations with accessible automated database sources. However, it is difficult to describe the exact form of these simplifications.

Tangible costs of the new system include costs of analysis, design and construction of the system, such as the recruitment of contractors or new employees, and the assignment of existing staff. Also consideration shall be given to hardware, software purchased and operating costs. Intangible costs include disturbances to the current activities caused by development and deployment and potential adverse effects on the morals of employees.

While the new system may feel good in the long term, short-term stress and other negative consequences will still be present. In the way that Reliable does virtually everything, the system is the focus of a major change. An organisation's monumental change has widespread negative effects on operations and employees.

Answer:

Systems implementation & evaluation

What is systems implementation?

What are the tools for physical systems design?

What are the issues to consider before an information system is operational?

What are the key indicators of a quality system?

What are the techniques for systems evaluation?

Systems implementation is the process of:

defining how the information system should be built (i.e., physical system design),

ensuring that the information system is operational and used,

ensuring that the information system meets quality standard (i.e., quality assurance).

Systems design

Conceptual design – what the system should do

Logical design – what the system should look to the user

Physical design – how the system should be built

Physical system design using structured design approach:

à To produce a system that is easy to read, code, and maintain

1. Factoring: decomposition

2. Span of control: 9 subordinate modules

3. Reasonable size: 50-100 LOC

4. Coupling: minimize inter-module dependency

5. Cohesion: single module functionality

6. Shared use: multiple calls to lower level modules from different bosses

Structured design tools

· Organization of programs and program modules (structure chart)

· Processing logic specification in each module (pseudocode)

Structure chart – to show graphically

how the various program parts/modules of an information system are physically organized hierarchically

how the modules communicate with each other through data couple (data exchange) and flag (control/message)

how the modules are related to each other in terms of sequence, selection, and repetition

Answer:

The answer is "Option c".

Explanation:

Computer simulation, use of a machine to simulate a system's vibration signals by another modeled system's behaviors. A simulator employs a computer program to generate a mathematical model or representation of a true system. It usually gives a lot of simplifications concerning the physical image or system that is modeled, so this statement describes the limitation of using a computer simulation in modeling a real-world object or process.

Answer: B. Perform a hash on the file for comparison with the vendor’s hash.

Explanation:

Before installing the firmware update, the step that the technician should perform to ensure file integrity is to perform a hash on the file for comparison with the vendor’s hash.

Hashing refers to the algorithm that is used for the calculation of a string value from a file. Hashes are helpful in the identification of a threat on a machine and when a user wants to query the network for the existence of a certain file.

Answer:

С The player had 3 bonus round attempts and 7 of them earned extra points.

Explanation:

Given

See attachment for correct code segment

Required

Which of the options is not possible?

From the question, we understand that:

[tex]attempts \to [1,4][/tex] --- attempt can only assume values 1, 2, 3 and 4

The following "if statement" is repeated three times

IF RANDOM[1,10] <= 7:

   success = success + 1

This implies that the maximum value of the success variable is 3

The first printed value is the attempt variable

The second printed value is the success variable.

From the list of given options, (a), (b) and (d) are within the correct range of the two variable.

While (c) is out of range because the value printed for variable success is 7 (and 7 is greater than the expected maximum of 3)

Answer:

bcoz of corona all churches and temples are closed and pilgrimage are cancelled

Answer:

It can identify the sources of polluted water.

Explanation:

Science can be defined as a branch of intellectual and practical study which systematically observe a body of fact in relation to the structure and behavior of non-living and living organisms (animals, plants and humans) in the natural world through experiments.

A scientific method can be defined as a research method that typically involves the use of experimental and mathematical techniques which comprises of a series of steps such as systematic observation, measurement, and analysis to formulate, test and modify a hypothesis.

An example of how science can solve social problems is that it can identify the sources of polluted water through research, conducting an experiment or simulation of the pollution by using a computer software application.

In conclusion, science is a field of knowledge that typically involves the process of applying, creating and managing practical or scientific knowledge to solve problems and improve human life.

Answer:

It can identify the sources of polluted water.

Explanation:

Answer:

The downloads folder ( C )

Explanation:

when you have difficulty locating a file on your computer you can look for the file in any of the options listed ( The recycle bin, Default folders like My Documents  or The Downloads folder )

But the best place out of these three options is the Downloads folder. and this is because by default all files downloaded into your computer are  placed in the Downloads folder regardless of the type of file

answer:

yes....................

Answer:

Windows button = You can see a Start Menu

Task view = You can view your Tasks

Search Box = You can search any app you want in an instance

Answer:

a,b,c,d,f,g are true only e is false

Answer:

Explanation:

The following code is written in Python. It takes in a story as a parameter and splits it into sentences. Then it adds those sentences into the list of lists called hamsplits, cleaned up and in lowercase. A test case is used in the picture below and called so that it shows an output of the sentence in the second element of the hamsplits list.

def Brainly(story):

   story_split = re.split('[.?!]', story.lower())

   hamsplits = []

   for sentence in story_split:

       hamsplits.append(sentence.split(' '))

   for list in hamsplits:

       for word in list:

           if word == '':

               list.remove(word)

Answer:

Central processing unit (CPU)

Explanation:

A computer can be defined as an electronic device that is capable of receiving of data in its raw form as input and processes these data into information that could be used by an end user.

The central processing unit (CPU) is typically considered to be the brain of a computer system. It is the system unit where all of the processing and logical control of a computer system takes place.

Hence, the most important component in a computer is the central processing unit (CPU) because without it, it is practically impossible for the computer to run any software application or program.

Additionally, the component of the central processing unit (CPU) that controls the overall operation of a computer is the control unit. It comprises of circuitry that makes use of electrical signals to direct the operations of all parts of the computer system. Also, it instructs the input and output device (I/O devices) and the arithmetic logic unit on how to respond to informations sent to the processor.

Answer:

OSI đề cập đến Kết nối hệ thống mở trong khi TCP / IP đề cập đến Giao thức điều khiển truyền. OSI theo cách tiếp cận dọc trong khi TCP / IP theo cách tiếp cận ngang. Mô hình OSI, lớp truyền tải, chỉ hướng kết nối trong khi mô hình TCP / IP là cả hướng kết nối và không kết nối.

Explanation:

dab

To access an online library, you will need a computer and an internet connection.

Online libraries are digital collections of books, journals, and other materials that are available to users through a web browser.

With a computer and internet access, users can browse, search, and read or download materials from the online library. Many online libraries also offer features such as personalized user accounts, bookmarking, and citation tools.

Online libraries have become increasingly popular as more content becomes available in digital format, making it easier and more convenient for people to access information from anywhere with an internet connection.

Read more about online library here:

https://brainly.com/question/20406929

#SPJ1

Answer:

nslookup

Explanation:

Nslookup command is considered as one of the most popular command-line software for a Domain Name System probing. It is a network administration command-line tool that is available for the operating systems of many computer. It is mainly used for troubleshooting the DNS problems.

Thus, in the context, the technician receives the error "Web page cannot be displayed" when he alternates to access different web page, the nslookup command is the best command tool to find the root cause of the connection problem.

Answer:

The Storage Spaces feature in Windows

Explanation:

The Storage Spaces feature can be used here. This feature was initiated in Windows server 2012 and allows the user store his files on the cloud or virtual storage. This makes it possible to have a flexible storage as there is a storage pool which is updated with more storage capacity as it decreases. The feature also offers storage security, backing up files to other disks to protect against total loss of data on a failed disk.

Answer:

I think digital,versatile

computer is an electronic digital versatile machine because once a task is initiated computer proceeds on its own till its completation.

Answer:

1. Secure drinkable water

2. Promote organic products through the provision of subsidiaries

3. Create a place for bioproducts to be sold

Explanation:

Without the use of pesticides and chemical products, organic farming does not toxic residues poison land, water, and air. Sustainable land and resource use in organic farming. Crop rotation promotes healthy and fertile soil.

In conventional farming, the use of pesticides contaminates runoff, which is a natural part of the water cycle. In groundwater, surface water, and rainfall, pesticide residues are found. This means that in food produced with pesticides, contamination may not be isolated, but also affect the environment.

Create a place for bioproducts to be sold

Biologics offer farmers, shippers, food processors, food retailers, and consumers a wide range of benefits. Biocontrols can also help protect the turf, ornamentals, and forests in addition to food use. They can also be used for disease and harm controls in public health, i.e., mosquitoes and the control of ticks.

The benefits of the use of biologicals in farming applications tend to be more direct, though they are indirect. The list includes benefits to crop quality and yield which help farmers supply consumer products worldwide with healthy and affordable fruit and vegetables. Biocontrols also allow farmers in their fields to maintain positive populations of insects (natural predators) through their highly-target modes of action, reducing their reliance on conventional chemical pesticides.

Answer:

[tex]E = 14.81\%[/tex]

Explanation:

Given

[tex]n = 150[/tex]

[tex]\sigma = 0.78[/tex]

[tex]c = 0.98[/tex]

Required

The margin of error (E)

This is calculated as:

[tex]E = z * \frac{\sigma}{\sqrt{n}}[/tex]

When confidence level = 0.98 i.e. 98%

The z score is: 2.326

So, we have:

[tex]E = 2.326 * \frac{0.78}{\sqrt{150}}[/tex]

[tex]E = 2.326 * \frac{0.78}{12.247}[/tex]

[tex]E = \frac{2.326 *0.78}{12.247}[/tex]

[tex]E = \frac{1.81428}{12.247}[/tex]

[tex]E = 0.1481[/tex]

Express as percentage

[tex]E = 14.81\%[/tex]

Answer:

The program in C++ is as follows:

#include <iostream>

#include <vector>

using namespace std;

int main(){

vector<int> nums;

int num;

cin>>num;

while(num != -1){

 nums.push_back(num);

 cin>>num; }  

for (auto i = nums.begin(); i != nums.end(); ++i){

    cout << *i <<endl; }

return 0;

}

Explanation:

This declares the vector

vector<int> nums;

This declares an integer variable for each input

int num;

This gets the first input

cin>>num;

This loop is repeated until user enters -1

while(num != -1){

Saves user input into the vector

 nums.push_back(num);

Get another input from the user

 cin>>num; }

The following iteration print the vector elements

for (auto i = nums.begin(); i != nums.end(); ++i){

    cout << *i <<endl; }

Answer:

import java.util.Scanner;

class Main {

 public static void main (String args[])

 {

   Scanner input = new Scanner(System.in);

   VendingMachine machine = new VendingMachine(20);

   System.out.print("Enter nr to purchase: ");

   int nrPurchased = input.nextInt();

   System.out.print("Enter nr to re-stock: ");

   int nrRestock = input.nextInt();

   machine.Transaction(nrPurchased, nrRestock);

   input.close();

 }

}

class VendingMachine {

 private int inventory;

 public VendingMachine(int initialInventory) {

   inventory = initialInventory;

 }

 public void Transaction(int nrToBuy, int nrToRestock) {

   inventory += nrToRestock - nrToBuy;

   System.out.printf("Inventory: %d bottles.\n", inventory);

 }

}

The program is an illustration of a sequential program, and it does not require loops, iterations and branches.

The program in java, where comments are used to explain each line is as follows:

import java.util.Scanner;

class Main {

public static void main (String args[]){

   //This creates a scanner object

  Scanner input = new Scanner(System.in);

  //This gets input for the number of purchases

  int Purchased = input.nextInt();

  //This gets input for the number of restocks

  int Restock = input.nextInt();

  //This calculates and prints the inventory

System.out.print("Inventory: "+(20 - Purchased + Restock)+" bottles");

}

}

At the end of the program, the net inventory is printed.

Read more about similar programs at:

https://brainly.com/question/22851981

Answer:

Explanation:

Qué tipo de solución alternativa estás buscando

Answer:

Yes that is most likely why your screen is popping out.

Explanation:

Most likely

Answer:

Following are the program to the given question:

public class Main//defining Main method

{

   char maxChar (char x1,char x2)//defining a method maxChar that takes two char parameter

   {

       if(x1<x2)//use if to compare char value

       {

           return x1;//return first char value

       }

       else//else block

       {

           return x2;//return second char value

       }

   }

public static void main(String[] args)//defining main method

{

    char x1,x2;//defining char variable

    x1='d';//use char to hold value

    x2='a';//use char to hold value

    Main ob=new Main();//creating class Object

 System.out.println(ob.maxChar(x1,x2));//calling method and prints its return value

}

}

Output:

a

Explanation:

In this code, a method "maxChar" is defined that holds two char variable "x1,x2" in its parameters, and use if conditional statement that checks the parameter value and print its return value.

In the main method, two char variable is declared that hold char value and passing the value in the method and prints its return value.  

Answer:

The illustration in Java is as follows:

import java.util.*;

import java.lang.Math.*;

class Main{

public static void main (String[] args){

 Scanner input = new Scanner(System.in);

 double num, root, temp;

 num = input.nextDouble();

 temp = num;

 while (true){

  root = 0.5 * ( (num / temp)+temp);

  if (Math.abs(root - temp) < 0.00001){

   break;   }

  temp = root;  }

 System.out.println("Root: "+root);

}}

Explanation:

This declares all necessary variables

 double num, root, temp;

This gets input for num (i.e the number whose square root is to be calculated)

 num = input.nextDouble();

This saves the input number to temp

 temp = num;

This loop is repeated until it is exited from within the loop

 while (true){

Calculate temporary square root

  root = 0.5 * ( (num / temp)+temp);

The loop is exited, if the absolute difference between the root and temp is less than 0.00001

  if (Math.abs(root - temp) < 0.00001){

   break;   }

Save the calculated root to temp

  temp = root;  }

This prints the calculated root

 System.out.println("Root: "+root);

Answer:

The following are brief descriptions or the three examples of the declaration presented.

Explanation:

Answer:

while (quantity >= 50)

Explanation:

Required

Stop when quantity is less than 50

To do this, we make use of a while statement and the syntax is:

while (condition){ }

If the loop should stop when quantity is less than 50; then it means the loop would continue when quantity is greater or equal to 50

So, we have:

while (quantity >= 50)