per hour. Suppose that E(60) = 40 and E' (60) = -0.7. (a) What are the units of E' (s)? (b) Let C(s) be the fuel consumption, in gallons per mile, of the car when it is driving s miles per hour. Find a formula for C(s) in terms of E(s). Calculate C' (60). (c) Let R(s), be the rate the car burns fuel, in gallons per hour, when the car is driving s miles per hour. Find a formula for R(s) in terms of E(s). Calculate R' (60). Question 5 In 1999, the population of Richmond-Petersburg, Virginia, metropolitan area, was 961,400 and was