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x = 6

Step-by-step explanation:

5 sides all the same length

s = 22.5/5

s = 4.5

x - 1.5 = 4.5

Add 1.5 to both sides

x = 6

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