The height of a tennis ball tossed into the air is modeled by h(x) = 40x – 16x 2, where x is elapsed time in seconds.During what time interval will the tennis ball be at least 15 feet above the ground?

Question

Revolt · Accepted Answer

x ≥ 0.5 seconds and x ≤ 2.04 seconds

Trigonometric Sum Identities — Cumulative exam

The height of a tennis ball tossed into the air is modeled by h(x) = 40x – 16x 2, where x is elapsed time in seconds.During what time interval will the tennis ball be at least 15 feet above the ground?

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