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Mamont248 [21]
3 years ago
6

Robert threw a rock off a bridge into the river. The distance from the rock to the river is modeled by the equation h=-16ť – 16t

+ 60, where h is the height in feet and t is the time in seconds. Find how long it took the rock to enter the water.​
Mathematics
1 answer:
cluponka [151]3 years ago
8 0

Answer:

1.5 seconds

Step-by-step explanation:

h=-16t² – 16t+ 60

When the rock enter the water, the height is 0. ... h=0

0 = -16t² – 16t+ 60 = -4 * (4t² - 4t +15) = -4* (2t - 3) (2t +5)

2t-3=0   or 2t+5 = 0

t = 3/2  or t = -5/2   (time can't be negative)

t = 3/2   or 1.5

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3 years ago
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Answer:

x = \frac{3}{4}

Step-by-step explanation:

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Answer:

<u>92 feet.</u>

Step-by-step explanation:

Given:

The length of the garden needs to be 22 feet longer than the width of the garden.

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What will the length be of garden ?

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As length of the garden needs to be 22 feet longer than the width,

<u>Let width</u> = x

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3 years ago
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Answer:

Step-by-step explanation:

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                               = 6* (5-4) = 6*1 =6

4 0
3 years ago
Read 2 more answers
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