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Question:

The formula h - 15 = 3.2t gives the height h in inches of a plant t weeks after planting. Which is the rate at which the plant's height is increasing?

A 3.2 inches per week
Explaination

h =15 + 3.2t gives the height of a shrub in inches after t weeks. When planting occurs the height is $6287_w135_h15.png$ 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