Respuesta :
Answer:
16 units.
Step-by-step explanation:
We have that RS = x + 9
RT = 2x and ST = 1
RT + ST = RS
2x + 1 = x + 9
2x - x = 9 - 1 , x = 8
So RT = 2x = 2(8) = 16
2x = x + 9 + 1
(Subtract x on both sides)
x = 9 + 1
(Combined like terms)
x = 10
(Subtract x on both sides)
x = 9 + 1
(Combined like terms)
x = 10
