There is a shop selling new compact disks and used compact disks. John bought 3 new compact disks and 8 used compact disks for $133.89. Michel bought 6 new compact disks and 2 used compact disks for $127.92. Find the cost of buying one used compact disk.

Astudent received the following grades last semester. find the student's semester grade point average. an a is algebra (3 credits), a b in history ( 3 credits), a in sociology ( 3 credits) a d in english ( 3credits) and a c in seminar ( 2credits). an a is worth 4 points, a b is worth 3 points a c is worth 2 points and a d is worth 1 point.

Eileen purchased 3.4 pounds of apples at the total cost of $19.72. if she purchases 6.2 pounds of apples at this store, how much would it cost?

Ineed in figuring out this problem.