Need help please! I added a picture for the question need help ASAP!

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?