Solve for the value of p

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

Select the quadratic that has root x = 8 and x = -5

What is the inverse of the function f(x) = 2x + 1?