Answer: 31.792.5 cu. ft. (<u>choice B</u>)
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Work Shown:

The result is approximate since
is approximate.
First, subtract the height he will grow to to the height he is now.
132 - 90 = 42
Now divide this from 3.5.
42 / 3.5 = 12
So it will take 12 months for him to grow to a height of 132 cm.
The red line is moving up from left to right, which means it is increasing.