Find the recurrence relation

Ak = 2.5^k

“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 .

It should be a or d i’m not sure

5\16 x 2\5 = 10/80simplify to 1/80