Simply the expression

15i

Step-by-step explanation:

-3+7i+3+8i

0+15i

Step-by-step explanation:

(-3+7i)-(-3-8i)= -3+7i+3+8i=15i

where's the diagrams?

for this pair of functions g(x)=x-2 and f(x)=|x| is (g o f)(a)= |a| -2

step-by-step explanation:

g(x)=x-2

f(x)=|x|

(g o f)(a)=?

(g o f)(x)=g(f(x))

(g o f)(x)=g(|x|)

(g o f)(x)=|x|-2

(g o f)(a)=|a|-2