Mathematics, 03.07.2019 08:30, phebusadrian01

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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The equation r=-0.0028t+20.8 can be used to predict the world record in the 200-m dash, where r is t...