Adam used three fraction to make a circle graph and colored each a different color. What fraction of the graph is not colored

Which two undefined geometric terms always describe figures with no beginning or end?

(fog)(x) if f(x)=x^2- 4 and g(x)=x^2 + 2 x, f(g(x))= f(x^2+2x) (x^2+2x)^2-4 (x^2+2x)(x^2+2x)-4 (x^4+2x^3+5x+4x^2)-4 x^4+2x^3+4x^2+5x-4 what am i doing wrong

Perform the indicated operation and write the answer in the form a + bi. (-5 + 2) + (3 - 6i)