If you can please put the steps

Explain how you can use the associative property to evaluate (7x50)x4.

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.

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?