What is the greatest common factor of 18x and 21?

Find the difference (8ab+a+2) - (3ab+6)

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.

Prove that quadrilateral is a rhombus.