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3 years ago

Section 1 - Question 9

Mathematics

1 answer:

Neko [114]3 years ago

6 0

The answer to this question is B

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Biologists tagged 139 fish in a lake on January 1, On February 1, they returned and collected a random sample

Bogdan [553]

Answer:

417 fish

Step-by-step explanation:

139/(10/30)=139*3=417

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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

Elvera Hilton earns $12 an hour at her job. The hours she worked during each of the last four weeks are shown below

Minchanka [31]

Answer:

12x7 4 times add it up u got the anwser

6 0

2 years ago

What is purpose of the underlined part of the sentence

shutvik [7]

I can’t see what the underlined word is

3 0

3 years ago

The troposphere extends from the Earth's surface to a height of 6–12 miles, depending on the location and the season. If a plane

Anni [7]

Answer:

2.8 miles higher the plane go without leaving the troposphere?

Step-by-step explanation:

Troposphere height on different locations= 6-12 miles

plane altitude at present flight = 5.8 miles.

Troposphere deepness from the present flight= 8.6 miles

So from present altitude till troposphere= 8.6-5.8= 2.8 miles

8 0

3 years ago