Find the missing number of each unit rate

If sin(x) = 0 and cos(x) = 1, what is tan(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.

What percent of 18 is 24? and plz explain thx.