Mathematics, 11.01.2020 07:31, jordanfwtm

If a paper plane is thrown from the top of a 147-foot cliff into the water below, the height of the plane at any given time can be determined by the formula h = -3t² + 147, where h is the height of the plane at t seconds. after how many seconds will the plane be at a height of exactly 20.25 feet? a. 7 seconds b. -6.5 seconds c. 6.5 seconds d. 7 seconds

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If a paper plane is thrown from the top of a 147-foot cliff into the water below, the height of the...