What are the center and radius of a circle defined by the equation x^2+y^2- 6x+ 8y+ 21=0?
a. center (3,-4); radius 4
b. center (3,-4); radius 2
c. center (-3,4); radius 2
d. center (-3,4); radius 4

me quick!

  n=   0.0000 - 0.3750 i  

  n=   0.0000 + 0.3750 i

step-by-step explanation:

one of these should be correct

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