document.write( "Question 119937: Your heart rate rises when you exercise. During aerobic exercise, your heart rate should be at least 0.7(220-a), but no more then 0.85(220-a), where a is your age. Find the target range if u are 14 years old. \n" ); document.write( "
Algebra.Com's Answer #87907 by checkley71(8403)\"\" \"About 
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.7(220-14)=.7*206=144.2 for the lower limit.
\n" ); document.write( ".85(220-14)=.85*206=175.1 for the upper limit.
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