Can anyone help me please

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Tan198=asin164=? how to solve this? ?