Please please help, im stuck in this question. Three brothers are saving for a special journey. The ratio of Oscar​'s savings to Liam​'s savings is 9:4 and the ratio of Liam​'s savings to Martin​'s savings is 4:5. Together all 3 brothers have saved ​$72. How much has each boy ​saved?

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.