Please help I don’t know math

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

Afair survey question is one that does not encourage biased responses. which survey question is fair? a.) do you agree that only unethical people take credit for other people’s work? b.) have you ever taken credit for somebody else’s work? c.) have you ever engaged in unethical behavior, such as taking credit for somebody else’s work? d.) don’t you think it is unethical to take credit for somebody else’s work?

If wxyz is a square, which statements must be true? plz < 3