Which property justifies the statement (2+1)+9=2+(1+9)

the median is   36 orr sum like dat

step-by-step explanation:

step-by-step explanation:

for exempl this   system of equations   y = x - 3

                                                                y = 2x - 5

look   the line : y = x -3     ( red)

                            the line : y = 2x -5 ( bleus)

54, jfvhgnjhvnjhcbnncjigjm

4932,9180,7625 are divisible by 9