:D The temperature went from -12°F to 18°F. Which of the following expressions could be used to find how much the temperature changed?

18 + (-12)
-12 - 18
-12 + 18
18 - (-12)

18 - (-12)

Step-by-step explanation:

Take the final temperature and subtract the initial temperature to find the change in temperature

18 - -12

18 - (-12)

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

step-by-step explanation:

a and d