Can somebody me solve these equations? ! you

What is the difference between the predicted value and the actual value

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.

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9