Subtract -7a^2 + 3a -9 from 5a^2 - 6a -4 answer should be polynomial in standard form

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.

Arecipe uses 2 cups of sugar to make 32 brownies. how many cups of sugar are needed to make 72 brownies?

What is x and y intercepts for y=x+7