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inna [77]
2 years ago
13

A cylindrical candle has a volume of approximately 400cm^3 and is 8 cm tall. What is the radius of the candle?

Mathematics
2 answers:
katrin2010 [14]2 years ago
6 0

Answer:

<h2><u>Solution</u><u> </u><u>:</u><u>-</u></h2>

We know that

V = πr²h

400 = 22/7 × r² × 8

400 × 7 = 22 × 7r²

2800 = 154r²

2800/154 = r²

18 ≈ r²

4.2 = r

ddd [48]2 years ago
4 0

Answer: r = 4.2

Step-by-step explanation: hope this helps

have a nice day

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Use intercepts to graph the linear equation -2x+7y=-21 Question 2
Anna11 [10]

Answer:

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The black dot represents the y-intercept on the attached graph. It is very clear at y = 0, x = -3.

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The red dot represents the x-intercept on the attached graph. It is very clear at x = 0, y = 10.5

Step-by-step explanation:

Given the linear equation

-2x+7y=-21

Determining the y-intercept

We know that the value of y-intercept can be determined by setting x = 0, and determining the corresponding value of y.

substituting x = 0 in the equation

-2x+7y=-21

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divide both sides by 7

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Therefore, the point representing the y-intercept is: (0, -3)

The black dot represents the y-intercept on the attached graph. It is very clear at y = 0, x = -3.

Determining the x-intercept

We know that the value of x-intercept can be determined by setting y = 0, and determining the corresponding value of x.

substituting y = 0 in the equation

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divide both sides by -2

-2x / -2 = -21 / -2

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The graph of the linear equation containing the y-intercept (0, -3) and x-intercept (10.5, 0) is shown and attached below.

The red dot represents the x-intercept on the attached graph. It is very clear at x = 0, y = 10.5

Please check the attached graph.

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Step-by-step explanation:

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Shalnov [3]

Answer:

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