For #36, why is the answer 4? plz explain.

I am getting 7 as the value of b. I do not believe 4 is a correct answer!

Here's why:

General equation of a circle in the xy plane

with being the x,y coordinates of the center.

The center point can be determined from the two endpoints of the diameter because the line segment is horizontal, so we just find the center of the x coordinates of the two points:

and the radius r = diameter/2 = 8-(-2)/2 = 5

so we have

Given a point on the circle (0,b) with b>0:

answer: ouch. thats difficult

step-by-step explanation:

answer:

125 yards

explanation:

75+50=125. that is my answer