Least common multiple of 4, 8 and 2

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.

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !

The ratio of the height of two similar cylinders is 4 to 3 what is the ratio of their volumes