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4 years ago

A swimmer completes 8 laps in 1/4 hour. What is the swimmer’s rate per hour ?

Mathematics

2 answers:

Rom4ik [11]4 years ago

8 0

Well if its 8 laps every 1/4, then you would times 8 by four, giving you the answer of 32.

OlgaM077 [116]4 years ago

6 0

Hello there, and thank you for posting your question here on brainly.

You can calculate this by finding out how much 1/4th of an hour is.

1/4 =.25

.25 of 60 is 20.

From here you can multiply 8 by four.

8 * 4 = 24.

The swimmer does 24 laps per hour.

Hope this helped!! ☺♥

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The sum of two numbers is 36. The first number is 1/5 of the second number. what are the numbers?

vfiekz [6]

Lets put this into an equation
x + 1/5 * x = 36
1.2x = 36
x = 30
1/5x = 6
So our final answer is 6 and 30.
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3 years ago

Work out the volume of the shape

pashok25 [27]

Answer:

$\large\boxed{V=\dfrac{1,421\pi}{3}\ cm^3}$

Step-by-step explanation:

We have the cone and the half-sphere.

The formula of a volume of a cone:

$V_c=\dfrac{1}{3}\pi r^2H$

r - radius

H - height

We have r = 7cm and H = (22-7)cm=15cm. Substitute:

$V_c=\dfrac{1}{3}\pi(7^2)(15)=\dfrac{1}{3}\pi(49)(15)=\dfrac{735\pi}{3}\ cm^3$

The formula of a volume of a sphere:

$V_s=\dfrac{4}{3}\pi R^3$

R - radius

Therefore the formula of a volume of a half-sphere:

$V_{hs}=\dfrac{1}{2}\cdot\dfrac{4}{3}\pi R^3=\dfrac{2}{3}\pi R^3$

We have R = 7cm. Substitute:

$V_{hs}=\dfrac{2}{3}\pi(7^3)=\dfrac{2}{3}\pi(343)=\dfrac{686\pi}{3}\ cm^3$

The volume of the given shape:

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Substitute:

$V=\dfrac{735\pi}{3}+\dfrac{686\pi}{3}=\dfrac{1,421\pi}{3}\ cm^3$

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3 years ago

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3 years ago

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fredd [130]

Answer:

a. 81.5%

Step-by-step explanation:

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