Respuesta :
Answer:
13+2a
Step-by-step explanation:
5+7+1 is 13. a +a is 2 a. Therefore, the answer is 13+2a!
13+a
5+7+1 is eight (8) and the a is the same variable so you just out them together
5+7+1 is eight (8) and the a is the same variable so you just out them together