What forces might cause a leftward shift of demand

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.

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

For what values of x is x2 + 2x = 24 true?