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Nastasia [14]
3 years ago
15

What is the exact circumference of a circle with a radius of 15 cm? Answers: A. 60cm B. 30cm C. 15cm D. 10cm

Mathematics
1 answer:
MAVERICK [17]3 years ago
8 0
r=15cm\\\\circumference:2\pi r\\\\2\pi r=2\pi\cdot15cm=30\pi cm
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She then measures the distance from the mirror to the base of the tree ... backwards until she sees the top of the tree reflected in the mirror.
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The answer would have to be D
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The sum of all three numbers is 12. The sum of twice the first number, 4 times the second number, and 5 times the third number i
DaniilM [7]

Answer:

The numbers are 7, 4 and 1

Step-by-step explanation:

Let the numbers =x, y, z.

The sum of all three numbers is 12, x+y+z=12--------i

The sum of twice the first number, 4 times the second number, and 5 times the third number is 35, 2x+4y+5z=35-------ii

The difference between 8 times the first number and the second number is 52, 8x-y=52---------iii

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substitute (iv) in (ii),

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collect like terms

-3x-y=-25

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solving (iii) and (v) simultaneously (add iii and v), we have

11x=77

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Put x=7 in (v)

3(7)+y=25

21+y=25

implies y=25-21=4

put x=7 and y=4 in (iv)

z=12-7-4=1

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4 0
2 years ago
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Step-by-step explanation:

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Answer:

Step-by-step explanation:

it's another one of those similar triangles

it's easier to see this one.

t /c = u / b

where

t = 7x + 3

c = 27

u = 35

b = 21

plug in the knowns

7x + 3 / 27 = 35 / 21

7x + 3  = 27 ( 35 / 21 )

7x + 3 = 9 ( 35 / 7 )     ( divided by 3 )

7x  + 3  = 9 ( 5)     ( 7 into 35 =5 )

7x  + 3  = 45

7x = 45 - 3

7x = 42  

x = 6

I checked it, the ratio is 1_2/3  :) for both, but you can check it too

7 0
3 years ago
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