How to simplify 1-c+4c-29

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 x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Find solution of the linear equation y = 2/3x + 1/3