The square of thrice a number a , take away double a second e

Then why is the question on here if you know the answer

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .