Are these right ? plus what is the answer for number

Plz heeeeeeelp plz give me the answer

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.

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