Which is the correct simplified version of the expression 12x + 18 -34x

Which graph represents the following piecewise defined function?

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?

What is the 12th term of b(n)=-4-2(n-1)