Explanation

h =15 + 3.2t gives the height of a shrub in inches after t weeks. When planting occurs the height is h = 15 + 3.2 * 1 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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