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2 years ago

The ratio of girls to boys in a gym class is 4 to 7. How many girls are there if there are 21 boys?

Mathematics

2 answers:

Romashka [77]2 years ago

8 0

Answer:

Step-by-step explanation:

multiply by the same number it took to get from 7 to 21 which is 3

Please mark brainliest

jek_recluse [69]2 years ago

4 0

Answer:

12 to 21

bc 21/7 = 3, 3x4=12

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Can someone help me out, please?

GenaCL600 [577]

Rectangle, triangle, and I believe square

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3 years ago

Find the inverse of the given relation.

Greeley [361]

Answer:

Step-by-step explanation:

first look at all the numbers in the relation.then since inverse means opposite find the answers where the numbers in the parenthesis are in the opposite order than the question. Finally look for the answer In which all the positive numbers in the parenthesis(in the given relation) are negative (on the answers)and the negative numbers (in the given relation) are positive (on the answers).

4 0

3 years ago

Emmanuel carves a cone-shaped hollow out of a solid clay cylinder. What is the approximate volume of the solid portion of the cy

bixtya [17]

Answer:

$3.14r^2(h-\frac{1}{3}h_1)$

Step-by-step explanation:

Let h be the cylinders height and r the radius.

-The volume of a cylinder is calculated as:

$V=\pi r^2h$

-Since the cone is within the cylinder, it has the same radius as the cylinder.

-Let $h_1$ be the height of the cone.

-The area of a cone is calculated as;

$V=\pi r^2 \frac{h}{3}\\\\=\frac{1}{3}\pi r^2h_1$

The volume of the solid section of the cylinder is calculated by subtracting the cone's volume from the cylinders:

$V=V_{cy}-V_{co}\\\\=\pi r^2h-\frac{1}{3}\pi r^2 h_1, \pi=3.14\\\\=3.14r^2(h-\frac{1}{3}h_1)$

Hence, the approximate area of the solid portion is $3.14r^2(h-\frac{1}{3}h_1)$

5 0

4 years ago

!20 points! Here are two expressions whose product is a new expression, A:

OLEGan [10]

Answer:

Whats A?

Step-by-step explanation:

6 0

2 years ago

(solving for y) <br> 4x-5=7+4y

alexira [117]

y = x - 3

1. Subtract 7 from the right to the left.
* 4y = 4x - 12
2. Divide the 4 (constant) next to the 'y' to the other side.
* y = 4/4x - 12/4
* y = x - 3

3 0

3 years ago