Respuesta :
12A + 2 + A - 1
combine like terms
12A + A = 13A
2 - 1 = 1
so we have : 13A + 1 <===
combine like terms
12A + A = 13A
2 - 1 = 1
so we have : 13A + 1 <===
12A + 2 + A - 1
Combine like terms
12A + A = 13A
2 - 1 = 1
13A + 1, or (D) is your answer
hope this helps