Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Moira has a canvas that is 8 inches by 10 inches. she wants to paint a line diagonally from the top left corner to the bottom right corner. approximately how long will the diagonal line be?

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school