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Lady bird [3.3K]
3 years ago
14

Find the circumference of circle if the diameter is 7.8cm​

Mathematics
1 answer:
olasank [31]3 years ago
4 0

Answer:

24.5

Step-by-step explanation:

the radius is half of a diameter

so the radius is 3.9

24.5 = 2πr= 2 * π * 3.9 ≈ 24.504

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How is 20.63 converted into 20 5/8
iren2701 [21]

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4 0
3 years ago
4x+5y=-13;5x-2y=-8 solve elimination method <br> Step by step
goldfiish [28.3K]
4x + 5y = -13
2(4x + 5y) = 2(-13)
8x + 10y = -26 (equation 1)

5x - 2y = -8
5(5x - 2y) = 5(-8)
25x - 10y = -40 (equation 2)

equation 1 + equation 2,
(8x + 10y) + (25x - 10y) = (-26) + (-40)
8x + 10y + 25x - 10y = -26 + -40
33x = -66
x = -2

substitute x = -2 into equation 1,
8x + 10y = -26
8(-2) + 10y = -26
-16 + 10y = -26
10y = -10
y = -1

The values of x and y are -2 and -1 respectively.
8 0
3 years ago
What is the coefficient of 8. 2N? Type a numerical answer in the space provided. Do not use spaces in your answer.
snow_tiger [21]

the coefficient of 8 · 2N is 16.

6 0
3 years ago
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