SOLUTION: The height, in feet, of an arrow is given by the equation h= -16tsquared +70t +7 where "t" is in seconds. How long will it take for the arrow to hit the ground? Please round your s

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Question 459628: The height, in feet, of an arrow is given by the equation h= -16tsquared +70t +7 where "t" is in seconds. How long will it take for the arrow to hit the ground? Please round your solution to the nearest tenth of a second.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
The height, in feet, of an arrow is given by the equation
h(t) = -16tsquared +70t +7 where "t" is in seconds.
How long will it take for the arrow to hit the ground?
Please round your solution to the nearest tenth of a second.
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Height is zero when the arrow hits the ground.
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-16tsquared +70t +7 = 0
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t = [-70 +- sqrt(70^2-4*-16*7)]/(-32)
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t = [-70 +- sqrt(5348)]/(-32)
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Positive solution:
t = 4.47 seconds
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Cheers,
Stan H.
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t = [