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Kazeer [188]
3 years ago
9

Find the distance between (4,2) and (-4,-4)

Mathematics
1 answer:
VikaD [51]3 years ago
3 0
Use the distance formula, and plug in values.
d = \sqrt{(x_{2}-x_{1} )^{2}+(y_{2}-y_{1} )^{2}}
<u />d = \sqrt{( -4-4 )^{2}+( -4-2 )^{2}}
d = \sqrt{( -8 )^{2}+( -6 )^{2}}
d = \sqrt{64+36}
d= \sqrt{100}

Therefore, the distance is equal to "10".




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He deposited $29, so a $29 dollar difference
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At Sara's new job she spent $11.52, $6.48, $5.99, $14.00, and $9.50 on lunch the first week. In the second week, she spent $4 mo
elena55 [62]
The total amount that Sara spent for her meals during the first week is,
                          $11.52 + $6.48 + $5.99 + $14.00 + $9.50 = $47.49
With an average of $9.498

During the second week, she spent $4 more making her total equal to $51.49. The average is equal to $10.298. The increase in the mean is equal to,
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4 0
3 years ago
Read 2 more answers
What is 3/5 written as a decimal?<br><br> a 0.12<br> b 0.3<br> c 0.6<br> d 1.67
horsena [70]

Answer: 0.6 so c

Step-by-step explanation:

7 0
2 years ago
Brewed decaffeinated coffee contains some caffeine. We want to estimate the amount of caffeine in 8 ounce cups of decaf coffee a
rusak2 [61]

Answer:

We would have to take a sample of 62 to achieve this result.

Step-by-step explanation:

Confidence level of 95%.

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.025 = 0.975, so Z = 1.96.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

Assume that the standard deviation in the amount of caffeine in 8 ounces of decaf coffee is known to be 2 mg.

This means that \sigma = 2

If we wanted to estimate the true mean amount of caffeine in 8 ounce cups of decaf coffee to within /- 0.5 mg, how large a sample would we have to take to achieve this result?

We would need a sample of n.

n is found when M = 0.5. So

M = z\frac{\sigma}{\sqrt{n}}

0.5 = 1.96\frac{2}{\sqrt{n}}

0.5\sqrt{n} = 2*1.96

Dividing both sides by 0.5

\sqrt{n} = 4*1.96

(\sqrt{n})^2 = (4*1.96)^2

n = 61.5

Rounding up

We would have to take a sample of 62 to achieve this result.

8 0
3 years ago
Mrs.Cranston bought five bottles of water for $0.90 each and 8 pounds of meat. She paid a total of $26.90 for these items, not i
Morgarella [4.7K]
Water = 5 bottles * $0.90 = $4.50
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The price per pound of meat is $2.80.
6 0
3 years ago
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