A.
10x3=30
15x3=45
7x3=21
All sides have increased in size by 3 times.
Using the permutation formula, it is found that the people can be chosen for the roles in 6840 ways.
The order in which the people are chosen is important, as there are different roles, hence the <em>permutation formula</em> is used.
<h3>What is the permutation formula?</h3>
The number of possible permutations of <u>x elements from a set of n elements</u> is given by:

In this problem, 3 people will be chosen from a set of 20 people, hence the number of ways is given by:

More can be learned about the permutation formula at brainly.com/question/25925367
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<h3>
<u>Explanation</u></h3>

A constant inside the square root will make the graph shift either left to right, depending on the number. From the equation. The graph shifts to right two units.
A constant outside the square root will make the graph shift up or down, depending the value. From the equation, the graph shifts up 3 units.
<h3>
<u>Answer</u></h3>
- Second Image, the first one where x = 2 and y = 3.
Y = 15(6) + 25
If you need me to elaborate on that please ask! Here to help :)