I need help with math I can't do surface area at all.​

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?

Which of the following is the shape of a cross section of the figure shown below

What is 1.5% of 120 or what number is 1.5% of 120