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SOVA2 [1]
4 years ago
12

Please help ASAP. Please show work if you can . Thank you!

Mathematics
2 answers:
AnnyKZ [126]4 years ago
7 0

Answer:

113.04 (estimated)

Step-by-step explanation:

I used the formula that includes pi.

basically multiply the radius by 2 and multiply the answer with π or 3.14 for the estimation.

(sorry I couldn't show the work it's pretty dark-)

Arlecino [84]4 years ago
5 0

Answer:

C = 2 π r

Step-by-step explanation:

Your answer is 2 pi/π r.

The formula of a circumference is always 2 pi r.

18 x 3.14 x 2 = 113.04

in this case radius is 18

pi is 3.14

2 is just always there when finding out circumference.

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DiKsa [7]

Answer:

idk but here's some steps

Step-by-step explanation:

1. Multiply the numbers

2. Multiply the numbers again

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4. Distribute

5. Combine multiplied terms into a single fraction

6. Multiply the numbers

7. Eliminate redundant parentheses

8. Subtract the numbers

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6 0
4 years ago
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kaheart [24]

Answer:

\cos\alpha\sin\alpha(\cos\alpha-\sin\alpha)

Step-by-step explanation:

First, simplify each term:

\sin\left(\dfrac{\pi}{2}+\alpha\right)=\cos \alpha\\ \\\cos \left(\dfrac{\pi}{2}+\alpha\right)=-\sin \alpha\\ \\\cos \left(\alpha-\dfrac{3\pi}{2}\right)=-\sin \alpha\\ \\\sin \left(\dfrac{3\pi}{2}+\alpha\right)=-\cos \alpha

Then given expression is equivalent to

\cos ^3\alpha+(-\sin \alpha)^3-(-\sin \alpha)+(-\cos \alpha)\\ \\=\cos ^3\alpha-\sin^3 \alpha+\sin \alpha-\cos \alpha\\ \\=(\cos\alpha-\sin\alpha)(\cos^2\alpha+\cos\alpha\sin\alpha+\sin^2\alpha)-(\cos\alpha-\sin\alpha)\\ \\=(\cos\alpha-\sin\alpha)(1+\cos\alpha\sin\alpha-1)\ \ [\cos^2\alpha+\sin^2\alpha=1]\\ \\=\cos\alpha\sin\alpha(\cos\alpha-\sin\alpha)

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3 years ago
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Helga [31]

Answer:

88

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2/5 * 220 = 88 boys in 7th grade

3 0
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