Please help due soon

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 area of the triangle shown 3 by 6

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did