3 years ago

What is the diameter of a circle with a 4.2 cm radius

Mathematics

1 answer:

4vir4ik [10]3 years ago

3 0

Answer:

8.4cm

Step-by-step explanation:

In a circle, d = 2r, so d = 2 * 4.2cm = 8.4cm

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Which one is it A. B. C. or D.

nadya68 [22]

7x + 2y = 2
2x - y = 10

2y = - 7x + 2
- y = - 2x + 10

2y = -7x + 2
y = 2x - 10

$y=\frac{-7x+2}{2}$
y= 2x - 10

y = -3.5x + 1
y = 2x - 10

Now, let's find "x" first by doing a substituion !

2x - 10 = - 3.5x + 1
y = 2x - 10

2x + 3.5x = 1 + 10
y = 2x - 10

5.5x = 11
y= 2x - 10

$x = \frac{11}{5.5}=2$
y= 2*2 - 10 = 4 - 10 = -6

In short, the answer would be : y = -6 (Option B).

Hope this helps !

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3 years ago

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2 years ago

Solve using the quadratic formula: 2n^2= 6n - 2

bekas [8.4K]

Answer:

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Step-by-step explanation:

$2n^2= 6n - 2\\\\2n^2-6n+2=0\\\\a=2\\\\b=-6\\\\c=2$

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Answer:

ergerge

Step-by-step explanation:

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2 years ago

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