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Vanyuwa [196]
3 years ago
5

Work out the surface area of a sphere please help if u get it correct i’ll give h brainlest

Mathematics
1 answer:
Bingel [31]3 years ago
5 0

Answer:

Surface area of sphere = 4πr²

r = radius

and radius = diameter/2

radius = 13/2

= 6.5cm

Surface area = 4 × π × 6.5

= 26 × π

= 81.68

= 81.7cm²

Hope this helps.

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danielle did not complete 15 of her 200 assignments last year. Kim said that is 0.075 of her assignments and Kelly said it is 0.
Alona [7]

Answer:

Kim

is correct

Step-by-step explanation:

Here, we want to know who is correct between Kim and Danielle

From the question, what is not completed is 15 out of 200

To find what is not completed, we divide 15 by 200

Thus, we have;

15/200 = 0.075

This mean Kim is correct

3 0
2 years ago
A cone with radius 2 and height 9 has its radius tripled. How many times greater is the volume of the larger cone than the small
SpyIntel [72]

Answer:

When increasing the radius 3 times the volume increases 9 times and when it is reduced to a third the volume decreases 9 times

Step-by-step explanation:

We have that the formula for the volume of a cone is:

Vc = pi * (r ^ 2) * h

We first calculate the original volume, where the radius is 2 and the height is 9, replacing:

Vc = 3.14 * (2 ^ 2) * 9

Vc = 113.04

Now if the radius is tripled it would be: 2 * 3 = 6, the radius would be 6, replacing:

Vc = 3.14 * (6 ^ 2) * 9

Vc = 1017.36

If we compare:

1017.36 / 113.04 = 9

This means that when the radius is tripled, the volume increases 9 times.

When if re reduces to a third the radius would be: 2/3, replacing:

Vc = 3.14 * ((2/3) ^ 2) * 9

Vc = 12.56

113.04 / 12.56 = 9

Which means that by reducing it to a third the volume becomes 9 times smaller.

6 0
3 years ago
What is the difference?<br> x2 - 2x-15<br> x2+2x-35
omeli [17]

Answer:

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Step-by-step explanation:

<h3>D</h3>
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Step-by-step explanation:

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3 0
3 years ago
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he table below shows 10 data values: What values of minimum, Q1, median, Q3, and maximum should be used to make a box plot for t
SVETLANKA909090 [29]
From the given data sets we shall obtain the answers as follows:
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Re-arrange the data in ascending order:
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from the above we see that:

Minimum value=301

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median=(325+328)/2=326.5

Q3=361

Maximum value=394

Thus the box plot will be as follows:

</span>

7 0
3 years ago
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