Why does hair grow after trimming but remains at a constant length after a while?

Some hair especially body hair regrows after trimming but stops growing after a while. What is the mechanism behind control of hair growth and how is the length limit determined?

05/19/19

Jenny’s test grades are 93, 89, 96, and 98. If she wishes to raise her average to 95, what does she need to score on her next test?

i found the average of the 4 numbers to be 94, how would i know that a 99 would bring her average to a 95?

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