Please I need help and show work

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?  

What is the solution set of the quadratic inequality x^2-5< or equal to 0

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?