# SOLUTION: If the formula R=-0.037x + 50.1 can be used to predict the world record in the 400-meter dash x years after 1925, for what years will the world records be 48.6 seconds or less?

Algebra ->  Algebra  -> Equations -> SOLUTION: If the formula R=-0.037x + 50.1 can be used to predict the world record in the 400-meter dash x years after 1925, for what years will the world records be 48.6 seconds or less?      Log On

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 Click here to see ALL problems on Equations Question 186403: If the formula R=-0.037x + 50.1 can be used to predict the world record in the 400-meter dash x years after 1925, for what years will the world records be 48.6 seconds or less?Answer by ankor@dixie-net.com(15649)   (Show Source): You can put this solution on YOUR website!If the formula R =-0.037x + 50.1 can be used to predict the world record in the 400-meter dash x years after 1925, for what years will the world records be 48.6 seconds or less? ; replace R with 48.6 and find x : -0.037x + 50.1 =< 48.6 : -.037x =< 48.6 - 50.1 : -.037x =< - 2.1 : .037x => 2.1; multiplied equation by -1, this reverses the inequality sign x => x => 56.8 ~ 57 yrs from 1925 : 1925 + 57 = 1982 and thereafter