Someone please help me with the unanswered questions

3) 87.9 or 1) 12.5

Step-by-step explanation:

they did multiply then subtract

x equals: 15

Step-by-step explanation:

7x= 5x + 30

-5    -5

2x= 30 (divide by 2 on both sides)

x=15

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

the answer is b