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Simplest form

What is the common difference in the following arithmetic sequence 7,3,-1,-5

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 the equation for x. 50(4x + 12) = 200