What is the value of x?

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

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 commission on a $590.00 sale if the commission is 15%.