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3 years ago

If you multiply four times the sum of my number and 2, you get 28. What's my number?

Mathematics

1 answer:

Karo-lina-s [1.5K]3 years ago

4 0

Answer:

Step-by-step explanation:

5+2 = 7

7x4 = 28

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What value of x makes this proportion true?<br> O A. 20<br> OB. 5<br> O C. 6<br> O 0.9

Archy [21]

B. 25/20 using gcf simplified is 5/4

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3 years ago

Read 2 more answers

A storage tank will have a circular base of radius r and a height of r. The tank can be either cylindrical or hemispherical (ha

Neko [114]

Answer:

Volume: $\frac{2}{3}\pi r^3$

Ratio: $\frac{2}{9}r$

Step-by-step explanation:

First of all, we need to find the volume of the hemispherical tank.

The volume of a sphere is given by:

$V=\frac{4}{3}\pi r^3$

where

r is the radius of the sphere

V is the volume

Here, we have a hemispherical tank: a hemisphere is exactly a sphere cut in a half, so its volume is half that of the sphere:

$V'=\frac{V}{2}=\frac{\frac{4}{3}\pi r^3}{2}=\frac{2}{3}\pi r^3$

Now we want to find the ratio between the volume of the hemisphere and its surface area.

The surface area of a sphere is

$A=4 \pi r^2$

For a hemisphere, the area of the curved part of the surface is therefore half of this value, so $2\pi r^2$ . Moreover, we have to add the surface of the base, which is $\pi r^2$ . So the total surface area of the hemispherical tank is

$A'=2\pi r^2 + \pi r^2 = 3 \pi r^2$

Therefore, the ratio betwen the volume and the surface area of the hemisphere is

$\frac{V'}{A'}=\frac{\frac{2}{3}\pi r^3}{3\pi r^2}=\frac{2}{9}r$

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3 years ago

Select the equation of the line that passes through the .5,7 and is perpendicular to the line x equals 4

lions [1.4K]

Hello!

To be perpendicular to x = 4, the line must be y = something. This eliminates answer choices #2 and #4. Also, to pass through the point (.5, 7), the line must be y = 7.

So answer choice #3.

Hope this helps!! Let me know if you have ANY questions.

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3 years ago

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natulia [17]

Answer:

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Step-by-step explanation:

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2 years ago