Apoint is on a circle if the distance from the center of the circle to the point is equal to the? a. area. b. circumference. c. radius. d. diameter.

Hello there! :D

A point is on a circle; if the distance from the center of the circle to the points is equal to the? 

"C". Radius. 

The radius is the half the diameter (if you were to cut the circle in half; that line would be the diameter) and since the line stated only went to the center point, this is the radius. 

I hope this helps!
~kaiker

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2