Please help

first question:

Which mathematical property is demonstrated?

5⋅7⋅4=5⋅4⋅7

associative property of addition

commutative property of addition

commutative property of multiplication

associative property of multiplication

2nd question:

Which expressions are equivalent to 4⋅(7⋅y)?

(choose all correct answers)

1. (7⋅y)⋅4

2. 4⋅7+4⋅y

3. (4⋅7)⋅y

4. 28y

5. 4⋅7⋅4⋅y

Last question
is 3(a−b) and 3a−3b Equivalent? yes/no

is 2a(2+b) and 4ab Equivalent? Yes/no

THANK YOU!!!