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Question:

The formula h -15 = 3.2t gives the height h in inches of a plant t weeks after planting. How high was the initial height of the plant?

A 15 inches
Explaination

Initial means at the beginning. At the beginning t is 0. h =15 + 3.2t gives the height of a shrub in inches after t weeks. When planting occurs the height is $7903_w135_h15.png$ inches