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Ugo [173]
3 years ago
10

Ok, last one I promise.

Mathematics
1 answer:
Papessa [141]3 years ago
4 0
All of them, so 10.
Check the key to see how to read it. 1 | 7 would be 17. So the number of pairs in each store are:
17, 18, 20, 25, 28, 34, 34 37, 38, and 40 (all below 60)
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18÷3(5-4+1) =??<br> 3 or 12 <br> how ?!
sergejj [24]

Answer:

12

Step-by-step explanation:

Parenthesis first:

5-4+1

5-4=1+1=2

18÷3×2

Divide:

18÷3×2

Multiply:

6×2=12

3 0
3 years ago
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Which expression is equivalent to 5(2 + 7)?
bogdanovich [222]
By using distributive property we get
5(2)+5(7)
Therefore you answer is D. 5(2)+5(7)
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Dave rented a jet ski for $6 per hours plus $20 for insurance. How many hours did he use the jet ski if he spent a total of $68?
Mekhanik [1.2K]

Answer:

8 hours

Step-by-step explanation:

6x+20=68

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Please help me with this question I am really confused
Mars2501 [29]

Step-by-step explanation:

The answer is consistent

5 0
3 years ago
Scores on the math portion of the SAT are believed to be normally distributed and range from 200 to 800. A researcher from the a
Doss [256]

Using the z-distribution, it is found that she should take a sample of 46 students.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

\overline{x} \pm z\frac{\sigma}{\sqrt{n}}

The margin of error is:

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

In which:

  • \overline{x} is the sample mean.
  • z is the critical value.
  • n is the sample size.
  • \sigma is the standard deviation for the population.

In this problem, we have a 95% confidence level, hence\alpha = 0.95, z is the value of Z that has a p-value of \frac{1+0.95}{2} = 0.975, so the critical value is z = 1.96.

Scores on the math portion of the SAT are believed to be normally distributed and range from 200 to 800, hence, by the Empirical Rule the standard deviation is found as follows:

6\sigma = 800 - 200

6\sigma = 600

\sigma = 100

The sample size is n when M = 29, hence:

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

29 = 1.96\frac{100}{\sqrt{n}}

29\sqrt{n} = 196

\sqrt{n} = \frac{196}{29}

(\sqrt{n})^2 = \left(\frac{196}{29}\right)^2

n = 45.67.

Rounding up, a sample of 46 students should be taken.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0
2 years ago
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