the formula R= -0.75t +3.85 can be used to predict the world record in the 1500 meter run, t years after 1930. Determine an inequality that identifies the years in which the world record will be less than 2.8 minutes.

Answer 1

R<2.8

-.75t+3.85<2.8

-.75t<-1.05
t>1.05/.75