What are the center and the radius of:
x^2 + 4x + y^2 - 20y + 100 = 0
c= (-2, 10) r=4
Oc=(2,-10);= 2
c= (-2, 10) r = 2
c=(2,-10) r=4

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

$54.99

step-by-step explanation:

$54.99 includes 500 min. if she does not exceed 500 min then her bill is $54.99

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