In a warehouse, boxes have been stacked in 4 layers as shown. The workers make other stacks according to the same pattern. If a stack has n layers, how many boxes are in the bottom layer?

“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 .