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laiz [17]
3 years ago
15

Evaluate -8.24+3.7 With steps

Mathematics
1 answer:
aleksklad [387]3 years ago
8 0
-8.24
+ 3.70
————
-4.54

Since the larger number is negative, you can act like the negative sign doesn’t exist and just subtract the 3.7 from the 8.24. Put the negative sign back for your final answer.
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g A researcher wants to construct a 95% confidence interval for the proportion of children aged 8-10 living in Atlanta who own a
Helga [31]

Answer:

The sample size needed is 2401.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error of the interval is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Estimate the sample size needed if no estimate of p is available so that the confidence interval will have a margin of error of 0.02.

We have to find n, for which M = 0.02.

There is no estimate of p available, so we use \pi = 0.5

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.02 = 1.96\sqrt{\frac{0.5*0.5}{n}}

0.02\sqrt{n} = 1.96*0.5

\sqrt{n} = \frac{1.96*0.5}{0.02}

(\sqrt{n})^{2} = (\frac{1.96*0.5}{0.02})^{2}

n = 2401

The sample size needed is 2401.

7 0
3 years ago
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13. which inequality has the following graphed solution?
mafiozo [28]
B. You have to solve for X, and graph using whatever is less than or greater than. 4x + 12 < 4 to 4x < -8 to x < -2.
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Help no idea what to do
malfutka [58]
The first cube is 12, the second one is 10. Just do length times width times height.
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The answer is 4x2-5x;Area= 114 in<span>2 i think</span>
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Simplify the expression.<br><br> (–2)5<br><br><br> 16<br><br><br> –10<br><br><br> –32<br><br><br> 32
BigorU [14]

Answer:

the answer is -10

Step-by-step explanation:

Its basically multiplication

4 0
3 years ago
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