Is 3.2 - 5.7 positive, negative or zero?

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?  

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

See attachment below and find the equivalent of tan(∠qsr)