The answer choices are:
-17
-8
-2
2
5
8
15

-8, 2, 15

Step-by-step explanation:

For a function each input value can have one and only one output value

Therefor -17, -2, 5, 8 cannot be input values because they already have output values other than 9

Valid inputs are

-8, 2, 15

c

step-by-step explanation:

i think because what else can be a sample of every member

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.