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Rainbow [258]
3 years ago
5

Y varies directly with the square x. If y= 27 when x = 3, find y when x = -4

Mathematics
1 answer:
Lana71 [14]3 years ago
6 0

Answer:

y~x²

y/x²= k

27/3²=3

therefore k= 3

y/ -4 = k

y / -4= 3

3y = -4

y = -4

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a force of 2 pounds is needed to stretch a spring 8 inches.what force is required to stretch the spring 16 inches
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Answer:

Four (4) pounds

Step-by-step explanation:

Because we required two (2) pounds to stretch the spring eight (8) inches, we need double the force to stretch it sixteen (16) inches. Sixteen is just double the original amount, meaning we need four (4) pounds to stretch the spring sixteen inches.

Hope this helps!

5 0
3 years ago
What is y=2x can someone pleas help me
strojnjashka [21]

Answer:

Slope:  2

Step-by-step explanation:

5 0
3 years ago
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An analyst from an energy research institute in California wishes to precisely estimate a 99% confidence interval of the average
Lena [83]

Answer:

190

Step-by-step explanation:

Data provided in the question:

Confidence level = 99%

Therefore,

α = 1% = 0.01

[ from standard normal table ]

z-value for z_{\frac{\alpha}{2}}= z_{\frac{0.01}{2}}= = 2.58

Margin of error, E = $0.06

Standard deviation, σ = $0.32

Now,

n = (\frac{z_{0.005}\sigma}{E})^2

Here,

n is the sample size (or the minimum number of gas stations  )

on substituting the respective values, we get

= (\frac{z_{0.005}\sigma}{E})^2

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Hence,

minimum number of gas stations that she should include in her sample is 190

5 0
3 years ago
The expression 14.50x can be used to find the total cost for x tickets on Family Night for admission and the movie. What is the
sp2606 [1]
All you have to do is substitute x for 3.
You get:
14.50 times 3

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The answer is $14.50
6 0
3 years ago
Your family drives 126 miles from Key West to the Florida mainland. About 15% of this distance is spent on bridges. How many mil
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<span>How many sixth graders were late? 6 sixth graders. Your family drives 126 miles from Key West to the Florida mainland. About 15% of this distance is spent on bridges. How many miles of bridges do you travel over? 18.9 miles or 18 9/10 miles.

</span>
i hope this helps u! and if u can will u make me the <span>Brainliest answer thank you :) </span>
8 0
3 years ago
Read 2 more answers
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