Which choice represent's the simplified exponential expression? (15^-6)9 a.15 b.15^-54 c.15^3 d.15^-15

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.