Can someone pls help

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.

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?