I need help with this

“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 .

Ithink it’s b because it say 3 plastic rings and all the balls

Not sure what the question is but i hope this x = years100 * x