Sydney is cutting the crust from the edges of her sandwich. the dimensions, in centimeters, of the sandwich is shown.

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

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.