How to write an equation for vertex form

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

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.

What is the slope of the line (-7,2) (4,6)