Solve for x.
Triangle similarity
Please answer both

20 ! need which shows a difference of squares? 10y^2-4x^2 16y^2-x^2 8x^2-40x+25 64x^2-48x+9

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning