All categories

2 years ago

Which of the following is true when representing a 1:1 binary relationship using the relational model

1 answer:

5 0

When a 1:1 binary relationship is represented by using the relational model: C) the key of either entity is placed in the other as a foreign key.

<h3>What is an entity relationship?</h3>

An entity relationship refers to a data model with the highest level of abstraction and it's designed to avail designers an ability to use a graphical tool to examine structures rather than describe them by using text.

In Computer technology, when a 1:1 binary relationship is represented by using the relational model, the true statement is that the key of either entity is usually placed in the other entity as a foreign key.

Read more on entity relationship here: brainly.com/question/14530873

#SPJ1

Complete Question:

Which of the following is true when representing a 1:1 binary relationship using the relational model?

A) The key of the entity with the highest minimum cardinality must be placed in the other entity as a foreign key.

B) The key of each entity must be placed in the other as a foreign key.

C) The key of either entity is placed in the other as a foreign key.

D) The key of the entity with the most attributes must be placed in the other entity as a foreign key.

E) Both entities must have the same primary key.

You might be interested in

Three students are working to find the solution set of this system of equations: y = 3x + 10 2y = 6x – 4 use the drop-down menus

horrorfan [7]

Answer:

Which of these is considered a long-term effect of alcohol abuse?

vomiting

slurred speech

impaired judgment

thin and brittle bones

Explanation:Which of these is considered a long-term effect of alcohol abuse?

vomiting

slurred speech

impaired judgment

thin and brittle bones

Which of these is considered a long-term effect of alcohol abuse?

vomiting

slurred speech

impaired judgment

thin and brittle bones

7 0

2 years ago

Rewrite the equation from step 1 substituting in the value of.

Masteriza [31]

By rewriting the equation from step 1 substituting the value of k into it, the value of x is 22.5

A direct variation is a type of variation that has two types of variables in which a variable can be expressed in terms of the other with its constant.

For example;

If x varies directly as y

Then

x $\sim$ y
x = ky ; where k is constant

The original question says:

if x varies directly as y, and x = 9 when y = 6, find x when y = 15

∴

x = ky

9 = k × (6)

k = 9/6

k = 1.5

Now, we can rewrite the equation from step 1 substituting the value of k into it:

∴

x = ky

when y = 15 and k = 1.5

The value of (x) will be:

x = 1.5 (15)

x = 22.5

Learn more about Direct variation here:

brainly.com/question/25798903

5 0

2 years ago

Which of the statements about mole ratios are true? select all that apply.

Serga [27]

The following are true of mole ratio

They are expressed as ratio of mass to molar mass
It is measured in moles

<h3>How to calculate the mole ratio</h3>

The formula for calculating the mole ratio is expressed according to the formula shown:

Mole ratio is the ratio of the mass of a substance to the molar mass of the same substance.

To calculate the mole ratio

Mole = Mass(g)/molar mass(g/mol)

Hence the following are true of mole ratio

They are expressed as ratio of mass to molar mass
It is measured in moles

Learn more on molar mass here: brainly.com/question/24236159

4 0

2 years ago

When the author quotes the video game researcher who said, it's difficult to find kids who earn poor grades but who do well in v

Semmy [17]

The author who quotes the video game researcher is using statistical argument.

<h3>What is statistical argument?</h3>

Statistical argument is an argument based on facts and figures from a research. This kind of argument requires the researcher to get values in order to make judgement.

Children who earn poor grades in school do well in playing video games. This is because, the researcher has found out how low they perform in class in terms of their test score and has used this as a measure to determine how poor they play video games.

Learn more about statistical argument:

brainly.com/question/5172738

4 0

2 years ago

The professor informs the class that there will be a test next week. what is the probability that a randomly selected student st

marusya05 [52]

The probability that students who were randomly selected studied for the test, if they pass it with a B or higher grade is: D. 0.80.

<h3>How to calculate the probability?</h3>

In this exercise, you're required to determine the probability that students who were randomly selected studied for the test, if they pass it with a B or higher grade. Thus, we would apply Bayes's theorem.

Let S represent studied for.

Let B represent a score of B or higher grade

Therefore, we need to find P(S|B):

$S|B = \frac{B|S \times S}{B|S \times S\; +\; B|S' \times S'} \\\\S|B = \frac{0.55 \times 0.6}{0.55 \times 0.6 \;+ \;0.2 \times 0.4}\\\\S|B =\frac{0.33}{0.33 + 0.08} \\\\S|B =\frac{0.33}{0.41}$

S|B = 0.80.

Read more on probability here: brainly.com/question/25870256

#SPJ1

<u>Complete Question:</u>

At the beginning of the semester, a professor tells students that if they study for the tests, then there is a 55% chance they will get a B or higher on the tests. If they do not study, there is a 20% chance that they will get a B or higher on the tests. The professor knows from prior surveys that 60% of students study for the tests. The probabilities are displayed in the tree diagram.

5 0

1 year ago