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TEA [102]
3 years ago
9

The ratio of boys to girls in a class is 3:1. There are 36 students in the class. How many students are girls

Mathematics
2 answers:
timofeeve [1]3 years ago
7 0

Answer:

The number of girls is 9

Step-by-step explanation:

divide 36 by 4 (as total is 4 (3:1))

36/4 = 9

AS the ratio of boys is three parts 3*9 is 27 (The no. of boys)

eduard3 years ago
6 0

Hi there!

Boys 3x

Girls x

Total 4x = 36

           x=9

        27 boys

         9 girls

Hope you understand,

Have a nice day,

Wolfiex

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A cylinder with a height of 12 cm has a volume of 1728 pi cm^ 3 What is the diameter of the cylinder?
blsea [12.9K]

Answer:

Step-by-step explanation:

let r be radius of the cylinder.

volume of cylinder=πr²h

1728π=πr²×12

r²=1728 π/12π=144

r=√144=12

diameter=2r=2×12=24 cm

3 0
3 years ago
Read 2 more answers
The equation 4x2 – 24x + 4y2 + 72y = 76 is equivalent to
DerKrebs [107]

Answer:

Option 4 is correct.

The equation 4x^2 -24x + 4y^2 + 72y = 76 is equivalent to 4(x-3)^2 + 4(y+9)^2 =436

Step-by-step explanation:'

Given equation: 4x^2 -24x + 4y^2 + 72y = 76

First group the terms with x and those with y;

(4x^2-24x)+(4y^2+72y) = 76

Next, we complete the squares.

We can do this by adding a third term such that the x terms and the y terms are perfect squares.

For this we must either add the same value on the other side of the equation or subtract the same value on the same side so that the equality is maintained.

⇒4(x^2-6x) +4(y+18y) = 76

or

4(x^2 -6x +3^2 -3^2) + 4(y^2 +18y +9^2 -9^2) = 76

4(x^2-6x + 3^2) - 36 + 4(y^2+18y +9^2) - 324 = 76

4(x-3)^2 + 4(y+9)^2 - 360 =76

Add 360 on both sides we get;

4(x-3)^2 + 4(y+9)^2 =360 +76

Simplify:

4(x-3)^2 + 4(y+9)^2 =436

Therefore, the given equation is equivalent to 4(x-3)^2 + 4(y+9)^2 =436

5 0
3 years ago
Which choice best describes the following sentence?
Wittaler [7]

Answer:

The choice that best describes the given sentence above is, it is a complete and correct sentence. What makes this sentence complete is having both the subject and the verb in a simple form, and still expresses a complete thought. The verb and simple predicate "volunteered" is enough to describe the subject "Cassidy".

6 0
3 years ago
2y to the power of 4 x 5y to the power of 3
Yakvenalex [24]

Answer:

(2•5y to the 7th power)

Step-by-step explanation:

Step 1:  (2y to the 4th power • 5) • y to the 3rd power

Step 2:  (2•5y to the 4th power) • y to the 3rd power

Step 3:  3.1    y to the 4th power multiplied by y to the 3rd power = y to the  (4 + 3) power = y to the 7th power

Final answer:  (2•5y to the 7th power)

6 0
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Alex73 [517]
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<span>What remains after you take it out on day 48 t </span>

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<span>192 6 = 32t </span>

<span>What remains after you take it out 32 t of the day? </span>
<span>192-32 = </span>160t<span>
</span>
7 0
4 years ago
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