Respuesta :
Answer:
3x+10
Step-by-step explanation:
Since the perimeter of a square is 4 times the side length, to find the side length given the perimeter, just divide by 4:
(12x+40)/4 = 3x+10
Therefore, the answer is 3x+10
ANSWER: 3x + 10
EXPLANATION: Since there are four sides you would divide 12x and 40 by 4
EXPLANATION: Since there are four sides you would divide 12x and 40 by 4