Help me !! Select all of the nets that can be folded and assembled into a cube

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')