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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?

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Question:

A
3.2 inches per week.

explanation

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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