Question

The equation of a circle is (x + 4)2 + (y + 6)2 = 16. Determine the length of the radius.
A. 10
B. 4
C. 16
D. 8

Answer 1

(x + 4)2 + (y + 6)2 = 16


(x + 4)2 + (y + 6)2 = 4^2


(x - (-4))2 + (y -(- 6))2 = 16


The equation is now in (x-h)^2+(y-k)^2 = r^2 form where (h,k) is the center and r is the radius


So we can see that r = 4


So the radius is 4 units

Answer 2

oops typo on last line, should be (x - (-4))2 + (y -(- 6))2 = 4^2

Answer 3

so then B?

Answer 4

yep

Answer 5

thank you!!

Answer 6

yw