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A projectile is thrown straight upward, and its height above the ground in meters as a...

A projectile is thrown straight upward, and its height above the ground in meters as a function of time in seconds is modeled by h(t)= 04.9t^2+550t+140

How long will it take for the projectile to be both falling downward and at a height of 1,350 meters?

Math   Precalculus   
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