I need help from numbers 18-20 and the proportions thank you!

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.

Ineed someone to me answer my question i have to have this done and knocked out

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is