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3 years ago

Help pleasee picture is added

Mathematics

1 answer:

s2008m [1.1K]3 years ago

7 0

Answer:

Gretta is correct

Step-by-step explanation:

4 =4×1 and 20= 4×5

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Simplify 3 square root 7 minus 5 square root 7

Ymorist [56]

Answer:

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4 0

3 years ago

Please help I’ll mark you as brainliest if correct

Nat2105 [25]

9514 1404 393

Answer:

the correct answer is marked

Step-by-step explanation:

You want k in the equation ...

scholars = k × teachers

Dividing by teachers, we get ...

k = scholars/teachers = 75/3 = 25

The constant of proportionality is 25.

3 0

3 years ago

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

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

6 0

3 years ago

A car travels at an average speed of 52 miles per hour How many miles does it travel in 5 hours and 45 minutes

hammer [34]

5 h 45 min = 5.75 hours

52 * 5.75 = 299 miles

3 0

3 years ago

Read 2 more answers

Ellus

Julli [10]

Answer:

range = 10

Step-by-step explanation:

The range is the difference between the largest and smallest values in the data set.

largest value = 12

smallest value = 2

range = 12 - 2 = 10

8 0

3 years ago