Complete the square to find the center and radius of each.. Full explanation and work Please..x2+y2+8x+8y=0

Pranza plotted point a in the coordinate plane below.

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50