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Mathematics 8 Online
OpenStudy (anonymous):

The height h of an arrow in feet is modeled by h(t) = -16t^2 + 63t + 4, where t is the time in seconds since the arrow was shot. How long is the arrow in the air? _____ s. Enter a number only.

OpenStudy (phi):

If you know the quadratic formula, you can solve for the t when h(t)=0 (the height is zero when the arrow hits the ground)

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