Arock climber's elevation above sea level changed −82 1/2 feet in 2 1/4 minutes as she descended.
what was the climber's average change in elevation per minute?
need: in about 5 minutes, test almost over

A rock climber's elevation above sea level changed −82 1/2 feet in 2 1/4 minutes as she descended.
so the the climber's average change in elevation per minute was:
x = -82 1/2 / 2 1/4x = (-165/2) / (9/4)x = (-165/2) x (4/9)x = -18 feet per minute is his change in elevation