In which of the following is y a function of x?

Bring the fraction a/a-4 to a denominator of 16-a^2

If you double the input of a function and it results in half the output, and if you triple the input and it results in a third of the output, what can be guessed about the function? check all that apply.

Mr. walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?