Please help me I will give you extra points and whoever the first one to answer I mark you with the brain thing. 7

What is the missing constant term in the perfect square that starts with x^2 -20x

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 number line represents the solution set for the inequality -1/2x> 24?