Part A- Which expression can be used for the missing side length of the rectangle? (See picture)

A. x√6
B. 2x
C. x√30
D. 2x√15

Part B-

Find the length of the missing side when x = 3. Round answer to the nearest tenth.

Length = N

I uploaded the answer to a file hosting. Here's link:

cutt.ly/zxt1ipy

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