9. a + 12 + 2a - 1
10. 8x - 3 + 8x + 3
11. 2x + 16 - 3x + 4
12. x + y - 2x-3y

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 solid has two triangular bases and three lateral faces, each in the shape of a rectangle? triangular prism triangular pyramid rectangular prism rectangular pyramid

Write the sentence as an equation. b increased by 281 is d