Explain your of the following rational expressions can be simplified?

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

Rose drew a regression line for this paired data set. her line passed through (1, 2) and (3, 5) . what is the equation of rose's regression line?

Answer this question, only if you know the answer. 30 points and brainliest!