You guys are smart please help me.

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?