A rainstorm begins as a drizzle, builds up to a heavy rain, and then drops back to a drizzle. The rater (in inches per hour) at which it rains is given by the function r = -0.5t - 4+2, where t is the time (in hours).
Select the graph of the function and determine for how long it rains and when it rains the hardest.

It rains for a total of_hours.

It is raining hardest at t =_
hours.