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4 years ago

A 9cm wife cross section pipe has a height of 13cm . What is the volume of the pipe

1 answer:

7 0

I think you meant "wide." :) Since it is a pipe, you should know that it is the shape of a cylinder. Therefore, the formula would be: πr^2h. Substitute the height for h. (π(4.5)^2(13). Since it's 9 cm wide total, divide it by 2 to get the radius (part of formula), which is 4.5 So multiply π times 4.5^2 (which equals 20.25) times 13. This all will equal 826.605. You can simplify this decimal to 827. Therefore, the volume is 827 cm^3.

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3 years ago

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In a class of 23 student the girls were 7 more than the boys how many boys were in the class

Softa [21]

Answer:

x=# of boys

x+7=# of girls

x+x+7=25

2x+7=25

2x=25-7

2x=18

x=18/2

x=9 boys

x+7=16 girls

If you don't understand variables use trial and error.

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4 11

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6 13

7 14

8 15

9 16 9+16=25 students

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3 years ago

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3 years ago

If P = (-2,7), Find:<br> Ry-axis (P)<br> ([?], [])

kumpel [21]

Answer:

(2, 7)

Step-by-step explanation:

$R_{\text{y-axis}}(\text{P})$ represents the reflection of a point P about the y-axis.

If a point (x, y) is reflected across y-axis, rule for the reflection is,

(x, y) → (-x, y)

If a point (-2, 7) follows the same rule, coordinates of the image point will be,

P(-2, 7) → P'(2, 7)

Therefore, answer is (2, 7).

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3 years ago