Solve for the principal, P: 100 = = P(1.05)3 P = $80.88 P = $76.78 P = $80.00 P = $86.38 A rock is thrown from the top of a cliff. The height of the rock above the ground after it has been thrown is modelled by the function h(t) - 5t2 +80 where h(t) is the height in metres and t is the time in seconds. How long does it take the rock to hit the ground? 85 seconds. 4 seconds 5 seconds 80 seconds

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