h(3) means that t = 3 seconds.
Replace t in the equation and solve:
h(t) = 4.9t^2+22t+5.5
h(3) = 4.9(3)^2+22(3) +5.5
h(3) = 4.9(9) + 66+5.5
h(3) = 44.1 + 71.5
h(3) = 115.6
This means the ball was 115.6 meters above the ground at 3 seconds.
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