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serious [3.7K]
3 years ago
13

The volume of a cylinder with a height of 25cm and a radius of 20cm

Mathematics
1 answer:
pentagon [3]3 years ago
7 0

Answer:

5652 cm³

Step-by-step explanation:

V = 2πr² + 2πrh

  = (2 × 3.14 × 3.14 × 20 ×20) + (2 × 3.14 × 20 × 25)

  = 2512 + 3140

  = 5652 cm³

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Softa [21]

Answer:

If the child is currently 6 years old and the mom is 42, in three years she'll be 45 and he'll be 9

Step-by-step explanation:

The son is y and the mom is x

x=7y

x+3=5(y+3)

7y+3=5y+15

7y=5y+12

2y=12

y=6

8 0
3 years ago
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Which of the choices below is not a possible correlation coefficient?
fiasKO [112]

Answer:

The condition for r is the following:

-1 \leq r \leq 1

And for this case if we analyze the options the only impossible value is given by:

1.0528

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Step-by-step explanation:

The correlation coefficient is a measure of dispersion and is a value between -1 and 1, and is defined as:

r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}

The condition for r is the following:

-1 \leq r \leq 1

And for this case if we analyze the options the only impossible value is given by:

1.0528

Because this value is higher than 1 and not satisfy the general limits for r

8 0
3 years ago
Someone pls help! Thanks!
dsp73

Answer:

is 1

Step-by-step explanation:

sorry if im wrong this is my first time doing this

4 0
3 years ago
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Calculate the ratio to the nearest hundredth (Please do them all for me)<br>PLEASE!
earnstyle [38]

All of them are 3.14

I got them all right on I ready :)))

8 0
3 years ago
Determine which statement is a true proportion.
Ratling [72]
The answer is option B.  11/12 = (13 3/4) /15

it could be considered a true proportion if both are equal in values.

In order to find this, you need to cross multiply the numerator and the denominator in all of those options and find which give the exact result.

11 x 15  = 13 3/4  x 12

165 = 165



7 0
3 years ago
Read 2 more answers
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