The braking distance D in feet required to stop a car traveling x miles per hour on dry, level pavement can be approximated by D=1/9x^2.

The braking distance D in feet required to stop a car traveling x miles per hour on dry, level pavement can be approximated by  D=1/9x^2.

(a)Calculate the braking distance for 20 miles per hour and 60 miles per hour. How do your answers compare?

(b) If the braking distance is 49 feet, estimate the speed of the car.

(c)Use a calculator to solve part (b) numerically. Do your answers agree?

Answer:

(a) _________Round to the nearest tenth as needed. 

(b)__________speed of the car 

(c)__________ do the answers agree?