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KengaRu [80]
3 years ago
14

What is the center and radius of the circle that has the equation x+72+y-42=49? Explain.

Mathematics
1 answer:
balu736 [363]3 years ago
3 0

Answer: The center is (-7, 4) and the radius is 7.

Step-by-step explanation:

The equation for a circle usually is:

(x - a)^2 + (y - b)^2 = R^2

where R is the radius, and (a, b) is the center of the circle.

I guess that the equation in this case is:

(x + 7)^2 + (y - 4)^2 = 49

then, in this case we have:

a = -7 and b = 4, then (a, b) = (-7, 4)

this means that the center of our circle is in the point (-7, 4)

and we know that:

R^2 = 49

R = √49 = 7

Then the radius is equal to 7.

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Answer:

a)  -    9/2   or   -0,45

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two runners start 30kilometer apart and run toward each other. they meet after 3hours. One Runner runs 2 kilometers per hour fas
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Let the slower runners speed be X kilometers per hour.

Then the faster runners speed would be X+2 kilometers per hour.


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Since there are two runners you need to add the both of them together.

The equation becomes 30 = 3x + 3(x+2)

Now solve for x:

30 = 3x + 3(x+2)

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24 = 6x

Divide both sides by 6:

x = 24/6

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The slower runner ran at 4 kilometers per hour.

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3 years ago
Use the discriminant to describe the roots of each equation. Then select the best description. 2 = x2 + 5x. A) Double root B) Re
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Answer:

Step-by-step explanation:

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