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3 years ago

2.) Simplify. -3m - 7n + 10m + 4n

Mathematics

2 answers:

diamong [38]3 years ago

8 0

4 is your answer lol

mezya [45]3 years ago

3 0

-3m - 7n + 10m + 4n collect the like terms
-3m+10m-7n+4n
7m-3n
answer=7m-3n

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forsale [732]

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3 years ago

What is the answer to -12=2+5v+2v

katovenus [111]

Answer:

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Step-by-step explanation: No the right answer? Let me know!

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3 years ago

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olga2289 [7]

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3 years ago

The population standard deviation for the heights of dogs, in inches, in a city is 3.7 inches. If we want to be 95% confident th

Aleks04 [339]

Answer:

The minimum sample size that can be taken is of 14 dogs.

Step-by-step explanation:

The formula for calculating the minimum sample size to estimate a population mean is given by:

$n=\frac{z^{2}\sigma^{2}}{e^{2}}$

The first step is obtaining the values we're going to use to replace in the formula.

Since we want to be 95% confident, $1-\alpha=0.95 \Rightarrow \alpha=0.05$ .

Therefore we look for the critical value $z_{\alpha/2}=1.96$ .

Then we calculate the variance:

$\sigma = 3.7 \Rightarrow \sigma^{2}=13.69$

And we have that:

$e=2 \Rightarrow e^{2}=4$

Now we replace in the formula with the values we've just obtained:

$n=\frac{1.96^{2}*13.69}{4}=13.1479\approx 14$

Therefore the minimum sample size that can be taken to guarantee that the sample mean is within 2 inches of the population mean is of 14 dogs.

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3 years ago

3. If the scale factor in a dilation is a number between 0 and

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3 years ago