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san4es73 [151]
2 years ago
12

Chloe drives from her house to her Grandma's house 48 miles away in an hour and 12 minutes. How fast was she driving on average?

Mathematics
2 answers:
Sphinxa [80]2 years ago
6 0

Answer:

I’m pretty sure 40 mph (sister aproved)

Step-by-step explanation:

zysi [14]2 years ago
5 0
The answer is forty miles per hour.
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Step-by-step explanation:

Given:

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d=-4x^2+1100

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Now, plugging in 100 for 'd' and solving for 'x', we get:

100=-4x^2+1100

Adding -1100 both sides, we get:

100-1100=-4x^2+1100-1100\\-1000=-4x^2

Dividing both sides by -4, we get:

\frac{4x^2}{4}=\frac{1000}{4}\\x^2=250

Taking square root and neglecting the negative root as time can't be negative. So,

\sqrt{x^2}=\sqrt{250}\\x=5\sqrt{10}=15.8\ s\approx 16\ s

Therefore, after 16 seconds, the snowboarder will be at a distance of 100 ft from bottom of hill.

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