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The formula h -15 = 3.2t gives the height h in inches of a plant t weeks after planting. When was the height 31 inches?

A Sometime between 3 and 7 weeks.

To find out when the height of the plant was 31 inches, we can substitute this value into the given formula and solve for t. The formula h - 15 = 3.2t represents the relationship between the height of the plant (h) and the number of weeks after planting (t). Substituting h = 31 into the formula:
31 - 15 = 3.2t
16 = 3.2t

To isolate t, divide both sides of the equation by 3.2:
16 / 3.2 = t
5 = t

Therefore, the height of 31 inches was reached 5 weeks after planting.

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