What is the equation of the circle if the endpoints of the diameter are (9,-4) and (-3,8)?

(x-3)² + (y+2)² = 72

Step-by-step explanation:

center is halfway between (9,-4) and (-3,8).

average of x-coordinates = (9-3)/2 = 3

average of y-coordinates = (-4+8)/2 = -2

center: (3,-2)

length of diameter = √[(9-(-3))²+(-4-8)²] = √288 = 12√2

radius = 6√2

(x-3)² + (y+2)² = (6√2)² = 72

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart