wage = 5.25 +.48 exper-0.008 exper2 where wage refers to the hourly wage rate and exper the number of years in the workforce. Derive the expression for the marginal effect of experience on wage. For what values of exper is the slope positive? Interpret your result. For what values of exper is the slope negative? Interpret your result. What value of exper makes the slope zero? Interpret your result. Sketch the quadratic equation.