Question

Use the associative law of multiplication to write an equivalent expression. 9[m(6+n)]

Answer 1

The associative law states that it doesn't matter how we group numbers when we add and/or multiply. So we could rearrange the brackets and parentheses to get the equivalent equation:
9m(6+n)

Both equations total:
54m+9mn 
(I applied the distributive property to solve it).