4x - 5y + 2xy = 0
Can Someone do this for me? I need help.

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.

Ineed with number 6 , explain how to get 1978

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.