Mrs. Campbell wrote five equations on the board. Which of the equations did she write correctly? Choose all that apply. 40 x 0 = 0
40 x 0 = 0

25 x 1 = 25
25 x 1 = 25

34 x 1 = 1 x 34
34 x 1 = 1 x 34

28 x 0 = 28
28 x 0 = 28

77 + 1 = 77