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A tree initially measured 18 ft tall. Over the next 3 1/2 years, it grew to a final height of 35 1/2 feet. During those 3 1 /2 years, what was the average yearly growth rate of the height of the tree?

 Apr 20, 2020
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The tree grew   35.5 - 18 ft = 17.5 feet in 3.5 years      this averages to   17.5 ft / 3.5 yr =  5 ft/yr

 Apr 20, 2020

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