Thanks i'll mark brainliest

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.

Which of the following expressions is equal to 2x^2+8

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)