A boy throws a baseball across a field. The ball reaches its maximum height, 18 meters, after 1 second. After approximately 2 point 3 seconds, the ball lands on the ground. The ball’s motion can be modeled using the function f of x is equal to negative 10 x squared plus 20 x plus 8 What is the height of the ball 1 point 5 seconds after it is thrown?
Substitute 1.5 seconds for x in the height function: f(1.5) = −10(1.5)² + 20(1.5) + 8. This gives −22.5 + 30 + 8 = 15.5 meters, so the correct choice is C, 15.5 meters.
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