F(x)=6x+8 what is f(3)?

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?

How do i do this activity, is appreciated

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.