Please help! I haven't been able to find this question answered on here.

Which expressions are equivalent?

Select Equivalent or Not equivalent for each pair of expressions.

Equivalent Not equivalent
3(a+b) and 3a+b
Equivalent – 3 open parenthesis a plus b close parenthesis and 3 a plus b
Not equivalent – 3 open parenthesis a plus b close parenthesis and 3 a plus b
4(x+2y) and 8y+4x
Equivalent – 4 open parenthesis x plus 2 y close parenthesis and 8 y plus 4 x
Not equivalent – 4 open parenthesis x plus 2 y close parenthesis and 8 y plus 4 x