Cory has 24packages of sunflower seeds. if each package has 15 seeds, how many sunflower seeds does he have altogether?

Can someone explain the elimination method to me for this problem?

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.

Factor and solve to find roots x squared -x - 90 =0