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maria [59]
3 years ago
8

What is the approximate circumference of a circle with a diameter of 500 kilometers? Use π ≈ 3.14.. . A.. 785 kilometers. . B..

1570 kilometers. . C.. 3140 kilometers. . D.. 3725 kilometers. .
Mathematics
2 answers:
Anestetic [448]3 years ago
8 0
3.14×500= 1570 kilometers
Arlecino [84]3 years ago
7 0
B. because the actual circumference is 1570.7963267948964 and if you round that it is 1570 since thats the main number and it isn't bigger than 5. I hope I helped! (:
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Two angles are complementary. One angle is ten less than four times the other angle. Find the measure of the larger angle
Nimfa-mama [501]

Answer:

B.70

Step-by-step explanation:

For one or two angles are complementary angle(s), they have to equal 90°.

So, we need to find the larger angle, but what about the other?

Let x be the other angle and y be the angle we are looking for

x + y = 90

Lets look for x first, since one angle is ten less than four times the angle we are looking for or visa versa, we must:

y = 4x - 10

For an exchange, lets take out the y variable for another x variable:

So now we should have x + 4x - 10 = 90

Combine like terms and do cross equation :

x + 4x -10 = 90

5x - 10 = 90

Add 10 to both sides:

5x = 100

100/5 = 20

So <u><em>x=20</em></u>

<u><em></em></u>

Now for y which is what we are looking for,

y = 4x - 10

Since x is 20, plug it in

y = 80 - 10

y=70 is our larger angle

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Answer:

c

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