Rowers and Speed The world record times in the 2000-m race are a function of the number of...

Rowers and Speed The world record times in the 2000-m race are a function of the number of rowers as shown in the ac­companying figure (www.cbs.sportsline.com). If r is the num­ber of rowers and t is the time in minutes, then the formula t = −0.39r + 7.89 models this relationship. Is this function invertible? Find the inverse. If the time for a 2000-m race was 5.55 min, then how many rowers were probably in the boat?