Plz help me with these last 2 questions

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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 quotient of m^6/5 ÷ 5/m^2? assume m does not equal pl