You have $900 to spend on a new deck. Write and solve an inequality that represents the cost per square foot that you can pay for the new deck if you want to build a deck that is 10 feet long and 15 feet wide.

Option D

Step-by-step explanation:

The  Associative Property of Multiplication allows you to group numbers in any combination, and still get the correct answer from it.

Option D '(3 x 6) x 2 = 3 (6 x 2)​' has the same numbers, but 3 and 6 are grouped while 6 and 2 are grouped on the other side.

Option D should be the correct answer.