I need help this is a tangent and secant problem and I'm confused

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.

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Find the solution set of this inequality. enter your answer in interval notation using grouping symbols. |8x-4| ≤ 12