Respuesta :
Answer:
US = 4x + 6
Step-by-step explanation:
if Z is between U and S then
US = UZ+ZS
US = x + 21 + 3x - 15
= 4x+6
Answer:
US = 4x + 6.
Step-by-step explanation:
If U, Z and S are all on the same straight line then US = UZ + ZS, so the answer is x + 21 + 3x - 15
= x + 3x + 21 - 15
= 4x + 6.
