Which proportion can be used to find X?

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality