A store buys cell phones from the manufacturer for $34.40 and marks them up by 85%. How much do they charge for the phones (what is the retail price)?

“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 .