Question 89477
The height h in feet of an object after t seconds is given by the function 
	h = –16t^2 + 90t + 3.  
How long will it take the object to hit the ground? 
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h=0 when the object is on the ground.
-16t^2+90t+3 = 0
t = [-90+-sqrt(90^2-4*-16*3)]/-32
t = 5.66 seconds
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Cheers,
Stan H.