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miss Akunina [59]
3 years ago
13

18 mRadius -DiameterAreaircumference

Mathematics
1 answer:
Elodia [21]3 years ago
6 0
Diameter is 18

radius is half of diameter so 9

area is radius*pi ^2 which is 88.83

circumference is diameter * pi so 18*pi = 56.55
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Two siblings' ages have a sum of 64 years. The older sibling was born 6 years before their young sibling.
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Hi!

So we have to make a system of equations here.

Let sibling 1 be O and sibling 2 be Y (for older and younger)

So:

O + Y = 64

O = 64 - Y

(Either one works)

The older sibling is 6 years older.

O = Y + 6

Make everything in terms of Y.

64 - Y = Y + 6

Same to both:

58 = 2y

2y = 58

Divide by 2 on both sides:

y = 29

Since the older sibling is 6 years older:

29 + 6 = 35

Y = 29

O = 35

Let me know if you have any questions.

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