Question 275780
The formula R= -0.075t + 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 3.7 minutes. Solve for t.
:
-0.075t + 3.85 < 3.7
-0.075t < 3.7 - 3.85
-0.075t < -.15
Multiply -1 to get rid of the negatives, this reverses the inequality sign
.075t > .15
t > {{{.15/.075}}}
t > 2 yrs
:
World record will be less that 3.7 min after 1932