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3 June, 15:36

The equation R=-0.0028t+20.8 can be used to predict the world record in the 200-m dash, where R is the record in seconds and t is the number of years since 1920. In what year will the record be 18.0 seconds?

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  1. 3 June, 17:25
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    The world record for the 200-m dash will be set at 18.0 seconds in the year 2920.

    Step-by-step explanation:

    To find what year the record will be 18 seconds, substitute 18 in for R, and solve for t.

    -0.0028t + 20.8 = R

    -0.0028t + 20.8 = 18

    -0.0028t = - 2.8

    t = 1000

    The record for the 200-m dash will be 18 seconds after 1000 years. To find which year this record will be set in, add 1000 to the original date, 1920.

    1920 + 1000 = 2920
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