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Maslowich
3 years ago
13

18, 19, and 20 please!

Mathematics
1 answer:
White raven [17]3 years ago
7 0
18 is 75! this is the answer to 18
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5 (5) - -2 =<br><br> ( worth 10 points)
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I think 27 is the answer

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Which equation has the same solution as 7x - 14 = 21?
Kryger [21]

Answer: 7 x 3 = 21

Step-by-step explanation:

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3 years ago
If your very smart then please help me​
wel

Answer:

brainly.com/question/12500028

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3 years ago
Solve for W:<br><br> 69=5w+9
Trava [24]
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3 years ago
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What size does the radius of a sphere need to be for its volume to be larger than its surface area? HINT! It is less than 10. HI
Lera25 [3.4K]
We know that
volume of a sphere=(4/3)*pi*r³----> (r/3)*(4*pi*r²)
and
surface area of sphere=4*pi*r²
so
the volume of a sphere=(r/3)*surface area of sphere
therefore
if r=3
volume of a sphere=(3/3)*surface area of sphere
volume of a sphere=surface area of sphere

if r> 3
the term (r/3) is > 0
so
volume of a sphere > surface area of sphere

if r<3
the term (r/3) is < 0
so
volume of a sphere < surface area of sphere

examples
1) for radius r=3 units
volume of a sphere=(4/3)*pi*3³----> 113.04 unit³
surface area=4*pi*3²----> 113.04 units²
volume is equal to surface area

2) for radius r=10 units
volume of a sphere=(4/3)*pi*10³----> 4186.67 unit³
surface area=4*pi*10²----> 1256 units²
volume is > surface area

3) for radius r=2 units
volume of a sphere=(4/3)*pi*2³----> 33.49 unit³
surface area=4*pi*2²----> 50.24 units²
volume is <  surface area
7 0
3 years ago
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