tjhe 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 idntifines the years in which the world record will be less than 2.8 mins

solve for t
t
round to neast whole number

Question

tjhe 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 idntifines the years in which the world record will be less than 2.8 mins  


solve for t 
t>
round to neast whole number

barrycarter · Answer

Solve -0.075t + 3.85 = 2.8 ( http://www.wolframalpha.com/input/?i=-0.075t+%2B+3.85+%3D+2.8), to see that t is about 14. Note that the formula can't really be accurate, since it would predict that someone will eventually run the race in less than 0 seconds!