The relational algebra expressions can be rearranged and achieve the same result but with a better processing time. A selection on an attribute can be moved from the outside of a query to a selection on just one of the relations being joined (if it isn't an attribute on both relations). Why would this be an improvement?
a. The selection on the joined results would cause a cartesian product operation
b. Moving the selection to the innermost relation keeps the depth of operations that have to be processed more shallow
c. This would reduce the number of tuples to involve in the join resulting in a more efficient query.
d. The outer selection would prevent the optimizer from picking the correct index

Answer:

20%

Convert fraction (ratio) 30 / 150 Answer: 20%

The first one.

Please I need one more braniest for 'expert' may I get it?

Explanation:

Answer:

no im not

Explanation:

but i sorry that you are

Answer:

The data that are needed to be included in the output is called as

Inputs are the signals or data received by the system and outputs are the signals or data sent from it. The term can also be used as part of an action; to "perform I/O" is to perform an input or output operation

Answer:

1. recycle bin

2. details view

3. move a file

Explanation:

i did the assignment on edge. and got it right

Answer:

In Windows, deleted files go to the

✔ Recycle Bin

If you want to see the most information about a file, you can view them in

✔ details view

A file manager can help you

✔ move a file

Explanation: Hope it helps ^w^

Answer:

a

the most suitable answer

Answer:

Following are the solution to the given points:

Explanation:

The Memory address value = 64 bit

The Size of the word [tex]= \frac{64}{8} =8 \ Byte[/tex]

In point a:

The offset size [tex]= 3\ bits[/tex] ( in 1-word block size)  

The Index size [tex]= 9 \ bits[/tex] (as block number =512)  

Tag size [tex]= 64 - 12 = 52\ bits[/tex]

In point b:

The offset size [tex]= 8 \times 8 \ bytes = 2^6 = 6 \ bits.[/tex]

The Index size [tex]= 64 \ bits = 2^6 \ =6 \ bits[/tex]

Tag size  [tex]= 64 - 12 = 52\ bits[/tex]

In point c:

The Ratio at point a  

[tex]\to 3:64[/tex]

The Ratio at point b

[tex]\to 6:64[/tex]

Answer:

Number 16 is A Or B And Number 17 is B I think

Explanation:

Answer:

Brenda works for the IRS reviewing paperwork.

Jenny reviews buildings to determine how much money they are worth

Kareem advises businesses to make sure they handle their finances correctly.

Explanation:

The best demonstrate likely tasks for Revenue and Taxation workers are:

a. Brenda works for the IRS reviewing paperwork.

b. Jenny reviews buildings to determine how much money they are worth

e. Kareem advises businesses to make sure they handle their finances correctly.

In practically every nation on the planet, governments impose taxes as mandatory levies on people or things. Taxation is primarily used to generate money for government spending, though it can also be used for other things.

A tax is a mandatory financial charge or another sort of levy that is placed on a taxpayer by a governmental entity in order to pay for public services and other expenses.

Taxes are essential because governments use the money they raise from them to fund social programs. Government investments in the healthcare industry would not be possible without taxes. Health services including social healthcare, medical research, social security, etc. are paid for by taxes.

Therefore, the correct options are a, b, and e.

To learn more about Revenue and Taxation, refer to the link:

https://brainly.com/question/29570932

#SPJ2

Answer:

A strictly dominates choice B in a multi-attribute utility. It is in your best interest to choose A no matter which attribute youare optimizing.

a. True

Explanation:

Yes.  It is in the best interest to choose option A which dominates choice B.  A Multiple Attribute Utility involves evaluating the values of alternatives in order to make preference decisions over the available alternatives.  Multiple Attribute Utility decisions are basically characterized by multiple and conflicting attributes.  To solve the decision problem, weights are assigned to each attribute.  These weights are then used to determine the option that should be prioritized.

Answer:

d

Explanation:

hi

Answer:

import javax.swing.JPanel;

import javax.swing.JOptionPane;

import javax.swing.JFrame;

import javax.swing.JLabel;  

import javax.swing.JTextField;

import javax.swing.border.Border;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.BorderFactory;

import javax.swing.JButton;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Graphics;

import java.awt.Rectangle;

public class DrawingPanel{

private static final int width = 800;

private static final int heigth = 500;

private static JFrame mainFrame;

private static JPanel mainPanel, inputPanel, drawPanel;

private static JLabel xLabel, yLabel;

private static JTextField xField, yField;

private static JButton drawButton;

public static void main(String[] args)

{

mainFrame = new JFrame("Draw Path");

mainPanel = new JPanel(new BorderLayout());

inputPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));

xLabel = new JLabel("X Coordinate: ");

xField = new JTextField(5);

yLabel = new JLabel("Y Coordinate: ");

yField = new JTextField(5);

drawButton = new JButton("Draw");

inputPanel.add(xLabel);

inputPanel.add(xField);

inputPanel.add(yLabel);

inputPanel.add(yField);

inputPanel.add(drawButton);

Border border = BorderFactory.createLineBorder(Color.black);

drawPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));

drawPanel.setBorder(border);

mainPanel.add(inputPanel, BorderLayout.NORTH);

mainPanel.add(drawPanel, BorderLayout.CENTER);

mainFrame.add(mainPanel);

mainFrame.setSize(PANEL_WIDTH, PANEL_HEIGHT);

mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

mainFrame.setLocationRelativeTo(null);

mainFrame.setResizable(false);

mainFrame.setVisible(true);

// action listener for draw button

drawButton.addActionListener(new ActionListener() {

(use the at sign here)Override

public void actionPerformed(ActionEvent e) {

if(xField.getText().equals("") || yField.getText().equals(""))

JOptionPane.showMessageDialog(null, "Please enter the x and y coordinates!");

else

{

int x2 = Integer.parseInt(xField.getText().trim());

int y2 = Integer.parseInt(yField.getText().trim());

if(x2 > WIDTH || y2 > HEIGHT)

JOptionPane.showMessageDialog(null, "x and y coordinates should be less than "

+ width + " and " + height + " respectively!");

else

drawPath(x2, y2);

}

}

});

}

public static void drawPath(int x2, int y2)

{

int x1 = (int)drawPanel.getBounds().getCenterX();

int y1 = (int)drawPanel.getBounds().getCenterY();

Graphics g = drawPanel.getGraphics();

Rectangle r = drawPanel.getBounds();

g.setColor(drawPanel.getBackground());

g.fillRect(r.x, r.y, r.width, r.height);

g.setColor(Color. blue);

g.drawLine(x1, y1, x2, y2);

}

}

Explanation:

The class DrawingPanel is a Java class that gets the user input for the coordinate of a path with predetermined heigth and width (defined in the class). The methods of the class are; getGraphics(), getBounds(), getBackground(), setColor() and fillRect(). The result is a rectangular path GUI on the screen.

Answer:

d ) all of the above

Explanation:

is the correct answer

Answer:

Easy-to-use virtual robotics and STEM platform tailored to serve every student at every level!

CoderZ is a powerful, award-winning online platform.

Explanation:

CoderZ is a powerful, award-winning online platform through which students learn valuable STEM skills such as coding, robotics, and physical computing. CoderZ is highly flexible and designed for use in the classroom or through a wide range of remote learning environments.  Computers and technology are everywhere. Studying science, technology, engineering and math gives kids valuable skills for the future and develop life-skills like computational thinking, critical thinking and problem-solving as well.

STEM and CS education focuses on how to approach complex problems, break down the challenges into small pieces and approach resolving them in a logical manner – critical skills for any career path.

Answer:

120

Explanation:

This question is basically asking how many ways can we arrange 5 sizes of shirts if they come in 4 colors.

5 permutation of 4

To find permutation, we use the formula

P(n, r) = n! / (n - r)!

Where

n is the size of the shirts available, 5

r is the color of each shirt available, 4

P(5, 4) = 5! / (5 - 4)!

P(5, 4) = (5 * 4 * 3 * 2 * 1) / 1!

P(5, 4) = 120 / 1

P(5, 4) = 120

Therefore, the total number of shirts available is 120

Answer:

def doMyMath(n):  

    if n == 1:  

         return n  

    else:  

         return n*doMyMath(n-1)  

Explanation:

This line defines the function

def doMyMath(n):  

This line checks if n is 1. If yes, it returns n (1)

    if n == 1:  

         return n  

If otherwise, it calculates the fibonacci recursively

    else:  

         return n*doMyMath(n-1)  

To call the function from main, you can use:

print(doMyMath(5))

or

num = int(input("Number: "))   --- This gets the number from user

print("Result: ",doMyMath(num)) --- This calculates the factorial

This question is answered in Python

Answer:

A

Explanation:

A because, why would someone want to listen to your own interests?

Answer:

D) Software problem

Explanation:

plz give me brainliest

D

edge2021      YWWWWWWWWWWWWWWWWWWWWW                                  

Answer:

C) someThing.someMethod( )

Explanation:

The methods in a class can be accessed outside the class (assuming they are public methods and not private to the class) by using the dot(.) symbol and calling the method on the instance or object of the class.

In this case, the object of the class someThing, calls the method, someMethod( ) by using a dot and the name of the method with a parentheses at the end. This enables the code in the method act on the class instance or object.

Answer:

The right answer is: Option C: Layout.

Explanation:

Columns are used to write text in a word document in more than one columns. Similarly, margins is the empty space that is left blank from all sides of the page. Orientation can be either landscape or portrait.

all these options are found in the Layout tab in MS word.

Hence,

The right answer is: Option C: Layout.

Answer:

ITS THE FIRST ONE :)

Explanation:

ALSO IF ITS NOT THE FIRST ONE GO ON YT!

Answer: Interpersonal communication is the process of face-to-face exchange of thoughts, ideas, feelings and emotions between two or more people. This includes both verbal and nonverbal elements of personal interaction.

Explanation:

i think plz dont be mad

Answer:

D. Because the technology needed for one person's utopia may be what creates disaster for another person's dystopia.

Explanation:

Because the technology needed for one person's utopia may be what creates disaster for another person's dystopia are people's visions of utopias and dystopias subjective. Thus option D is correct.

Speculative fiction categories that study social as well as political structures include utopian and dystopian literature. In order to pique readers' interest, utopian fiction often depicts a world that adheres to the author's ethics and has many elements of a different reality.

Ultimately, it all varies depending on who you ask. A person's dystopia may be another person's utopia. We don't all have the same notions regarding what a utopia would look like, which is, in my opinion, one of the grounds why people don't live in one. Therefore, option D is the correct option.

Learn more about utopias and dystopias, Here:

https://brainly.com/question/905235

#SPJ2

Answer: Transgenic

Explanation:

Since the thale cress is a plant that is genetically engineered with genes that break down toxic materials, the type of organism that is described here is the transgenic plant.

Transgene is when a gene is naturally transferred or transferred from an organism to another organism by genetic engineering method.

Therefore, the correct option is transgenic.

Answer:

The answer is B (transgenic)

Explanation:

Answer:

returns a different value every time you use it

Explanation: :)

Answer:

#include <iostream>

#include <cstdlib>

#include <ctime>

using namespace std;

int main(){

   int n;

   cout<< "Enter the row and column length: ";

   cin>> n;

   int array_one[n][n];

   int array_transpose[n][n];

   for (int i = 0; i < n; i++){

      for (int j= 0; j < n; j++){

           srand((unsigned) time(0));

           array_one[i][j] = (rand() % 4000)

           array_transpose[j][i] = array_one[i][j];

       }

   }

}

Explanation:

The C source code has three variables, 'array_one', array_transpose' (both of which are square 2-dimensional arrays), and 'n' which is the row and column length.

The program loops n time for each nth number of the n size to assign value to the two-dimensional array_one. the assign values to the array_transpose, reverse the 'i' and 'j' values to the two for statements for array_one to 'j' and 'i'.

Answer:

import numpy as np

word = input("Enter a word: ")

acc = []

with open("Downloads/record-collection.txt", "r") as file:

   lines = file.readlines()

   for line in lines:

       if word in line:

           line = line.strip()

           acc.append(int(line[0]))

   if np.mean(acc) >= 2:

       print(f"The word {word} is a positive word")

       print(f"{word} appeared {len(acc)} times")

       print(f"the review of the word {word} is {round(np.mean(acc), 2)}")

   else:

       print(f"the word {word} is a negative word with review\

{round(np.mean(acc), 2)}")

Explanation:

The python program gets the text from the review file, using the user input word to get the definition of reviews based on the word, whether positive or negative.

The program uses the 'with' keyword to open the file and created the acc variable to hold the reviews gotten. The mean of the acc is calculated with the numpy mean method and if the mean is equal to or greater than 2 it is a positive word, else negative.