3 years ago

Idk pls help me I really need help with my math

Mathematics

1 answer:

Natali5045456 [20]3 years ago

3 0

Question 8=d
Question 9=c

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3 years ago

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Janet plans to save $22.50 each week until she has enough to buy a $180 bicycle. After how many weeks will she have enough money

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8weeeks bc 22.50*8=180

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2 years ago

I will give the brainliest answer

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3 years ago

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The average human heart beats 75 times every minute. The average horse has a heartbeat of 40 times every minute. How many times

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4500

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3 years ago

Use differentials to estimate the amount of paint needed (in m3) to apply a coat of paint 0.04 cm thick to a hemispherical dome

pogonyaev

The amount of paint is the volume of paint needed.

The amount of paint needed is 0.065312 cubic meters

<h3>How to determine the amount of paint needed</h3>

The volume of a hemisphere is:

$V = \frac 23\pi r^3$

Differentiate the above equation

$V' = 2\pi r^2 r'$

The above equation represents the estimate of the amount of paint needed.

Where:

r represents the radius (r = 52/2 m)
r' represents the thickness (r' = 0.04 cm)

So, we have:

$V' = 2\pi r^2 r'$

$V' = 2 * 3.14 * (52/2\ m)^2 * (0.04cm)$

$V' = 2 * 3.14 * (26\ m)^2 * (0.04cm)$

Express cm as m

$V' = 2 * 3.14 * (26\ m)^2 * (0.0004m)$

$V' = 0.065312 m^3$

Hence, the amount of paint needed is 0.065312 cubic meters