How do i solve 7 - n = 27

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.

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?

How do i put 3(x+7) in distributive property