Plz it is due in 30 min plz helppp

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?  

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

Rationalize the denominator- 12x/√x-10