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Question:
h =15 + 3.2t gives the height of a shrub in inches after t weeks.
When planting occurs the height is 15 + 3.2 × 0 = 15 inches .
After one week the height is 15 + 3.2 = 18.2 inches .
The rate at which the height increases is 18.2 - 15 = 3.2 inches
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