A rope with knots marking 12 equal parts has been used since ancient times for checking that corners are square. Explain how this rope can be used to confirm a right angle.

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.