Hello, and thanks for posting your question!
A function would be a set of ordered pairs that have no repeating "x" values, look at the example below. (V)
{(1, 0), (2, 0), (3, 0)} = Function
{(1, 0), (1, 0), (2, 0)} = Not a function.
According to this information, your answer is C. Both Set A and Set B.
Hope this helps! ☺♥
I got 12.654 I'm not sure it is right though.
So because 25%=1/4 we would know to multiply 9*4
Which would get our answer to be 36 :)