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OlgaM077 [116]
3 years ago
6

What is the equation of a circle with center (9,-7) and radius 2?

Mathematics
1 answer:
kirza4 [7]3 years ago
3 0

Answer:

B. (x-9)^2 + (y + 7)^2 = 4

Step-by-step explanation:

The standard form of a circle is (x-h)^2 + (y-k)^2 = r^2. Hopefully you can memorize that, because it's very helpful in these problems!

(h,k) is our center, and r is our radius, so plug those values into the standard form:

(x - 9)^2 + (y + 7)2 = 2^2

2^2 = 4, so

<u>B. (x - 9)^2 + (y + 7)2 = 4 is our answer!</u>

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We round a number to three significant figures in the same way that we would round to three decimal places. We count from the first non-zero digit for three digits. We then round the last digit. We fill in any remaining places to the right of the decimal point with zeros.

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Translate the triangle left 1 units and up 5 units. What are the coordinates of point C after the translation?
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What is the sum of the complex numbers 3 − 4i and 5 + 3i ?
Mandarinka [93]

Answer:

8 - i

General Formulas and Concepts:

<u>Algebra I</u>

  • Combining Like Terms

<u>Algebra II</u>

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Step-by-step explanation:

<u>Step 1: Define</u>

(3 - 4i) + (5 + 3i)

<u>Step 2: Simplify</u>

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  2. Combine like terms (i):                      8 - i
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3 years ago
How to solve x^2+x-90=0 in completing the square method​
tigry1 [53]

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x² + x - 90 = 0

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x² + 2 • x/2 + (1/2)² = 361/4

(x + 1/2)² = 361/4

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2 years ago
Prove AED is equal to DEB. Do not use vertical angle theorem
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Answer:

Step-by-step explanation:

From the figure attached,

Given:

Lines AB and CD are intersecting each other at a point E.

To prove:

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1). ∠AEC + ∠BEC = 180°                        1). Linear pair theorem

2). ∠DEB + ∠BEC = 180°                       2). Linear pair theorem

3). ∠AEC + ∠BEC = ∠DEB + ∠BEC      3). Transitive property of equality

4). ∠AEC = ∠DEB                                  4). Subtraction property of equality

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