I read that as
|R-136| ≤ 20
-20 ≤ R-136 ≤ 20
add 136
116 ≤ R ≤ 156
you are correct
A student keeps track of his target heart rate when he is exercising. The range for the number of heart beats per minute R for someone his age is /R-136/ less than or equal to 20. Determine the solution to the inequality. I believe the answer is: (116,156). Am I correct?
/R-136/ less than or equal to 20,
-20 less than or equal R-136 less than or equal to 20, leaves 116 less than or equal to R less than or equal to 156.
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