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In-s [12.5K]
3 years ago
9

A pilot of a helicopter plans to release a bucket of water on a forest fire. The height y in feet of water t seconds after its r

elease is modeled by y=−16t2−2t+400
. How long will it take for the water to reach the ground? round to the nearest decimal.
Mathematics
1 answer:
frosja888 [35]3 years ago
4 0
You’re gonna have to use the quadratic formula here and a bit of thinking. We know y is height, and once it touches the ground, it will be 0.

(-b +- sqrt b^2 - 4ac)/2a
2 +- sqrt(4 + 48(400))/-32
(2 +- 138.58)/-32
We don’t want a negative time because it’ll make no sense. So do subtraction

(2-138.58)/-32 = 4.27 seconds aka 4.3 seconds
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The area of a rectangular fountain is x2 + 9x + 20 square feet. A 3-foot walkway is built around the fountain. Find the dimensio
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Answer:

(x+11) by (x+10)

Step-by-step explanation:

We know that Area = Length x width

Given: Area = x²+9x+20

Lets sort this out first

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Area = x(x+5) + 4(x+5)

Area = (x+5) (x+4)

Therefore, it is concluded that:

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Width 'w' = (x+4) feet

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Answer:

The fountain is (x+5) by (x+4).  

dimensions of the outside border of the walkway are (x+11) by (x+10)

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3 years ago
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