Evaluate log2 1/16. help please.

Having a hard time understanding this question (see attachment).

This circle is centered at the origin, and the length of its radius is 6. what is the circle's equation? a. x^2+y^2=36 b x^2+y^2=6 c x+y=36 d x^6+y^6=1

Show all work to identify the discontinuity and zero of the function f of x equals 6 x over quantity x squared minus 36