Collins middle school has 210 sixth grade students. if the sixth grade is 35% of the total school, how many students are in the middle school?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

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.

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?