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arsen [322]
3 years ago
6

A rock is thrown and follows the curve given by the equation d = -t2 + 4t + 5, where d is the distance in feet and t is the time

in seconds. When will the rock hit the ground? 9 seconds 5 seconds 2 seconds 1 second

Mathematics
1 answer:
GaryK [48]3 years ago
8 0

Answer:

5 seconds

Step-by-step explanation:

The relationship between "d" and "the ground" is not described. If we assume that "d" is distance above the ground, then the rock will hit the ground when d=0. This gives rise to the quadratic equation ...

-t^2 +4t +5 = 0

-(t -5)(t +1) = 0

t = 5 or t = -1 are solutions. Only the positive solution is useful.

The rock will hit the ground after 5 seconds.

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Answer:

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Step-by-step explanation:

To start the absolute difference between 20 and 5 is 15. Next, write out an equation for the problem:

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Then divide by 1.5 on both sides...

Boom! x < 10.

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Step-by-step explanation:

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3 years ago
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Answer:

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