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maksim [4K]
2 years ago
7

Help help help help help

Mathematics
1 answer:
Ugo [173]2 years ago
8 0

Answer:

I'm pretty sure it's c but I'm not sure

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Archimedes calculated the volume of a sphere by comparing it to what solid? prism cylinder pyramid box
Stella [2.4K]
<h2>Answer:</h2>

cylinder

<h2>Step-by-step explanation:</h2>

Archimedes was a brilliant mathematician. This man rose the formula of the volume of a sphere by comparing this shape to a cylinder. The volume of a sphere is hard to calculate by comparing this object to a cube. So Archimedes imagined cutting a sphere into two halves, called hemispheres.  So an hemisphere gave him a flat surface, which is easier to work with. Therefore, if he'd find the volume of a hemisphere, then he'd multiply the result by 2 and would get the volume of a sphere. Then he imagined a hemisphere within a cylinder as the one shown below. Also, he imagined a cone within the same cylinder. <em>What did he find?  </em>He found that the volume of the hemisphere should be equal to the volume of the cylinder minus the volume of the cone:

V=\pi r^3-\frac{1}{3}\pi r^3 \\ \\ V=\frac{2}{3} \pi r^3

Then the volume of a sphere is twice this volume:

\boxed{V=\frac{4}{3} \pi r^3}

3 0
3 years ago
You have c cookies. Brooke has twice as many cookies as you do. Which expression correctly shows how many cookies Brooke has?
adelina 88 [10]

Answer:

I would put A

Step-by-step explanation:

Because B C D all say plus and that is wrong

<em>it this was helpful can I please have brainliest</em>

3 0
2 years ago
Read 2 more answers
A car travels 126 miles in 3 hours. At this rate, how many miles can the car travel in 4 hours?
almond37 [142]

Answer:

<h2>A. 168</h2>

Step-by-step explanation:

\bold{METHOD\ 1:}\\\\\begin{array}{ccc}126\ mi&-&3h\\\\x\ mi&-&4h\end{array}\qquad\text{cross multiply}\\\\3x=(126)(4)\\3x=504\qquad\text{divide both sides by 3}\\x=168\ mi

\bold{METHOD\ 2:}\\\\126\ mi\ \text{in}\ 3\ h,\ \text{then}\ \dfrac{126\ mi}{3}=42\ mi\ \text{in}\ 1\ h.\\\\\text{If}\ 42\ mi\ \text{in}\ 1\ h,\ \text{then}\ (42\ mi)(4)=168\ mi\ \text{in}\ 4h.

4 0
3 years ago
Lillian works 7 hours each day for 5 days a week.
blsea [12.9K]

Answer:$12 dollars and hour

Step-by-step explanation:

7 hours times 5 days a week equals 35 hours. 420/35 hours equals 12 dollars

6 0
3 years ago
If (x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x))?
Goryan [66]

I think its x                  ,,,,,,,,

3 0
3 years ago
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