HELP Which of the following expressions illustrates the commutative property of addition?

4 + (1 + 8) = (4 + 1) + 8

-4(5) = 5(-4)

3 + (-7) = (-7) + 3

-2(6 + 8) = (-2)(6) + (-2)(8)

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.