Question

Please answer and don't do it just for the points.

Answer 1

`3 \cdot (5\cdot x)` is equivalent using the commutative property of multiplication.

`5 \cdot 3+x\cdot 3` is not equivalent because the distributive property is not applicable here.

`5 \cdot (x \cdot 3)` is equivalent using the associative property of multiplication.

`15x` is equivalent because
`(5)(3)(x)=15x`.

`5 \cdot 3 \cdot x \cdot 3` is not equivalent because the extra factor of 3 was arbitrarily introduced.