Suppose that while driving a car, you suddenly see a deer standing in the road. Your brain registers the information and sends a signal to your foot to hit the brake. The car travels a distance D, in feet, during this time, where D is a function of the speed r, in miles per hour, of the car when you see the deer. That reaction distance is a linear function given by D(r) = 11/10 r + 1/2.

(a) Find the slope of this line and interpret its meaning in this application.
(b) Graph D.
(c) Find D(5), D(10), D(20), D(50), and D(65).
d) What is the domain of this function? Explain.