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Rus_ich [418]
3 years ago
14

6 + (4+9) =19 Rewrite using the Associative Property

Mathematics
1 answer:
maw [93]3 years ago
8 0

5*4*6=120
4+(6+9)=19
675+9=75
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The height, h, in feet of a rock above the ground is given by the equation h = -16t^2 + 24t + 16, where t is the time in seconds
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The rock will hit the ground at 2 seconds.

Explanation:

Given that the height, h, in feet of a rock above the ground is given by the equation h=-16t^2+24t+16, where t is the time in seconds after the rock is thrown.

We need to determine the time at which the rock will hit the ground.

To determine the time, let us equate the height h = 0 in the equation h=-16t^2+24t+16, we get,

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Switch sides, we have,

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Thus, we have,

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Simplifying, we get,

t=\frac{-24 \pm \sqrt{576+1024}}{-32}

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t=\frac{-24 \pm 40}{-32}

Hence, the two values of t are

t=\frac{-24 + 40}{-32}   and   t=\frac{-24 -40}{-32}

Simplifying the values, we get,

t=\frac{16}{-32}  and  t=\frac{-64}{-32}

Dividing, we get,

t=-\frac{1}{2}  and  t=2

Since, t cannot negative values, we have,

t=2

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Answer:

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0.6666666666666...

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