How do I find the missing length for this

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.

How do you find principle and simple interest

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)