Answer: 20 ( Choice A )
Step-by-step explanation: You can prove that triangle RTS and triangle RTU are the same using the Side-Angle-Side method, so ultimately, side RS should equal RU. Therefore, 8x = 6x + 5.
x should equal 2.5. The question is asking you how long side RU is, simply plug in 2.5 and you get 20.