document.write( "Question 620405: The equation R=-0.028t+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?\r
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Algebra.Com's Answer #390104 by nerdybill(7384)\"\" \"About 
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The equation R=-0.028t+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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\n" ); document.write( "Set R to 18 and solve for t:
\n" ); document.write( "R=-0.028t+20.8
\n" ); document.write( "18=-0.028t+20.8
\n" ); document.write( "subtracting 20.8 from both sides:
\n" ); document.write( "-2.8=-0.028t
\n" ); document.write( "dividing both sides by -0.028:
\n" ); document.write( "-2.8/(-0.028) = t
\n" ); document.write( "100 = t
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\n" ); document.write( "Since t is defined as \"the number of years since 1920\" we have:
\n" ); document.write( "1920+100 = 2020 (this is your answer)
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