## Algebra 1

$18x$
We start with the given expression: $9(2x)$ The associative property of multiplication states that changing the grouping of the factors does not affect the product. We use this property to group the factors differently: $(9\times2)\times x$ We use the order of operations to simplify. We simplify inside the parentheses with multiplication: $18\times x$ We multiply: $18x$