The braking distance D in feet required to stop a car traveling x miles per hour ondry, level pavement can be approximated by Upper D equals one ninth x squared

D=19x2.

(a) Calculate the braking distance for 20

20 miles per hour and 70 per hour. How do the answerscompare?

(b) If the braking distance is 25, estimate the speed of the car.

(c) Use a calculator to solve part(b) numerically. Do these answersagree?

(a) The braking distance for 20 miles per hour is

_____ft

(Round to the nearest tenth asneeded.)

The braking distance for 70 miles per hour is

___ ft.

(Round to the nearest tenth asneeded.)

(b) Estimated speed is approximately

_____mph.

(Round to the nearest whole number asneeded.)

(c) Estimated speed is approximately

______mph

(Round to the nearest whole number asneeded.)