Zachary plans to collect $0.30 from each person that comes to the party to cover the cost of the candy. pounds 2.0

Iam so stuck. what is the worked out answer for this question?

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Explain how you can use the associative property to evaluate (7x50)x4.