Respuesta :
Answer:
Elli and the associative property of addition
Step-by-step explanation:
Answer:
They are both correct
Step-by-step explanation:
Elli says 3 + (x + 1) is equivalent to (3 + x) + 1.
Gabe says 3 + (x + 1) is equivalent to 3 + (1 + x).
Who is correct and what property did they use?