Four corners codehs answers 2.12.5

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-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.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?