Mathematics

A pine tree measured 40 1/2 feet tall. Over the next 7 1/2 years,it grew to a height of 57 feet. During the 7 1/2 years, what was the average yearly growth rate of the height of the tree?


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Sultanan

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A pine tree measured 40 1/2 feet=(40 + 1/2) feet=(80+1)/2 ft=81/2 feet it grew to a height of =57 7  1/2 years=(14+1)/2=15/2 year. Then, during 7  1/2 years the pine tree has grown=57 ft - 81/2 ft= =(114-81)/2 ft= 33/2 ft. average yearly growth= (number of meters that the pine tree has grown) / number of years average yearly growth=(33/2) ft / (15/2) years=33/15 ft / years=2.2 ft/year. solution. 2.2 ft / year.

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