The Associative Property states that the grouping of numbers does not affect the sum.
Applying the Associative Property to the given expression, 30m+(21m−53)+(18−2m), we can rearrange the terms to group the like terms together.
30m + (21m - 2m) + (-53 + 18)
Simplifying the grouped terms:
30m + 19m + (-35)
Combining the like terms:
(30m + 19m) - 35
Adding the terms within the parentheses:
49m - 35
Therefore, the expression equivalent to 30m+(21m−53)+(18−2m) is (49m - 35). The correct answer is D.