Question 7 • Fall 24 GMS Advanced Algebra: Concepts and Connections A
At the canyon floor, the rock’s height is 0, so solve −16t² + 255 = 0. Using the quadratic formula gives t = ±√(255/16), which is approximately ±3.99 seconds. Since time after the rock is dropped must be positive, the rock reaches the floor in about 4 seconds, matching choice B, “t = 4 s.”
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