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3 years ago

3x+4=5メー10 How to slove

Mathematics

2 answers:

ser-zykov [4K]3 years ago

5 0

Answer:

Step-by-step explanation:

3x+4=5x-10

First, you have to combine your variables. By doing this you subtract 3x from both sides of the equation.

3x+4=5x-10

-3x -3x

4=2x-10

Next, you have to combine your whole numbers. In order to do so, you can subtract 2x and 4 from both sides so it would look like this:

4=2x-10

-2x -2x

-2x+4=10

-4 -4-

2x=-4-10

After that, you simplify -4-10, which is -14. Your equation should look like this:

-2x=-14

Finally, you need to isolate x. In order to do that, you need to divide -2 from both sides since you are multiplying -2 and x with the expression -2x.

-2x=-14

-2 -2

Your final answer is: x=7

Rudik [331]3 years ago

4 0

Yu have to multiply 3 with the 5 with that answer

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IgorLugansk [536]

Answer: The depth of the snow has changed .4 inches. This is because it has melted in the warm weather. You can find the difference, by subtracting 1.6 from 2.

Step-by-step explanation:

2 - 1.6= .4 .4 would be your answer

Hope it helps!!!!

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3 years ago

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estim

pogonyaev

Answer:

$n=\frac{0.5(1-0.5)}{(\frac{0.025}{1.28})^2}=655.36$

And rounded up we have that n=656

Step-by-step explanation:

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 80% of confidence, our significance level would be given by $\alpha=1-0.80=0.20$ and $\alpha/2 =0.10$ . And the critical value would be given by:

$z_{\alpha/2}=\pm 1.28$

Solution to the problem

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

Since we don't have prior info for the proportion of interest we can use $\hat p=0.5$ as estimator. And on this case we have that $ME =\pm 0.025$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.025}{1.28})^2}=655.36$

And rounded up we have that n=656

5 0

3 years ago

Please help!!!!!!!!!!!!!!!!!!!!!!!!

brilliants [131]

Answer: P=47 inches

Step-by-step explanation:

First, you have to find the other side lengths. Two of the sides are equal to 20 because this is a rectangle. The first blank would be 20 because 20 times the other side length is equal to 70. Then you would divide 70 by 20 which would equal x. x would equal 3.5 in. Then the perimeter would be:

2(20)+2(3.5)=P

P=47 inches

7 0

3 years ago

4 1/4 + (-1 3/4) what is the answer

aliya0001 [1]

Answer:

2.5 or 250.

Step-by-step explanation:

7 0

3 years ago

Please help me I do not understand what to do

fgiga [73]

Answer:

3 7/12

Step-by-step explanation:

There are 12 inches in 1 feet. So 43 inches would be 43/12=3 7/12 feet.

7 0

3 years ago

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