Solve for x: 7x + 12 = 47

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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.