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dmitriy555 [2]
3 years ago
15

Find the GCF of 21, 30

Mathematics
2 answers:
sweet-ann [11.9K]3 years ago
5 0

Answer:

The GCF of 21 and 30 is 3.

Step-by-step explanation:

Find the prime factorization of 21

21 = 3 × 7

Find the prime factorization of 30

30 = 2 × 3 × 5

To find the gcf, multiply all the prime factors common to both numbers:

Therefore, GCF = 3

Evgesh-ka [11]3 years ago
3 0

Answer:

3

Step-by-step explanation:

Factors of 21: 1, 3, 7, 21

Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

The GCF is the largest factor they both have.

GCF = 3

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Setler [38]

Answer:

19.6 cubic centimeters

Step-by-step explanation:

The ratio of two similar 3D figures' volumes is equivalent to the ratio of their corresponding lengths (whether it's width, height, length, radius, etc) cubed.

Here, we know the cones are similar, and we know the smaller radius is 2 and the larger radius is 3. Then the ratio of the volume of the smaller one to the volume of the larger one is (2/3)^3=8/27.

We also know the actual volume of the larger cone is 66. So, if x is the volume of the smaller cone, we have the proportion:

x / 66 = 8 / 27

Cross-multiply:

27x = 66 * 8 = 528

Divide by 27:

x = 528/27 ≈ 19.6

The answer is thus 19.6 cubic centimeters.

<em>~ an aesthetics lover</em>

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3 years ago
What is 19/36 simplified?
Mariulka [41]
Since 19 is a prime number (a number that only has 2 factors:  one and itself), 19/36 is the simplest form.
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y =mx+b

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3 years ago
What invention is Gerry Thomas known for?
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A certain three-digit number equals fifteen times the sum of its digits. if its digits are reversed, the resulting number exceed
lara31 [8.8K]
If the digits are a, b and c, the number n is 100a+10b+c

Here are the equations:

a number equals fifteen times the sum of its digits:

100a+10b+c = 15(a+b+c)

if its digits are reversed, the resulting number exceeds n by 396:

100a+10b+c+396 = 100c+10b+a

the one’s digit is one larger than the sum of the other two:

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Solving it gives you a=1, b=3, c=5, the number is 135.
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3 years ago
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