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Today, 01:57

Write the standard equation of a circle with center (-9,-4) and radius 15.

(x + 9) 2 + (y + 4) 2 = 5

(x + 4) 2 + (y + 9) 2 = 5

(x - 4) 2 + (y - 9) 2 = 5

(x - 9) 2 + (y - 4) 2 = 5

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Answers (1)
  1. Today, 02:36
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    Equation of a circle:

    radius = the sq. rt of (x - h) ^2 + (y - k) ^2

    Plug in the values for the center of a circle and the radius:

    15 = the sq. rt of (x + 9) ^2 + (y + 4) ^2

    (x + 9) ^2 + (y + 4) ^2 = 225

    The answer is A or the first one.
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