On rural highways, the average speed S (in miles per hour) is related to the amount of curvature C (in degrees) of the road. On a straight road (C = 0), the average speed is 46.26 miles per hour. This decreases by 0.746 mile per hour for each additional degree of curvature.
a) The slope of the linear function between S and C is mile per hour per degree. (Give your answer to three decimal places.)
b) The linear relation between S and C is S = –0.746C (Give your answer to two decimal places.)
c) If the degree of curvature is 15 degrees then the average speed is miles per hour. (Round your answer to a whole number.)