What's the difference quotient:
f(x)=x^3

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 value of x in the following equation? -3x-2=2x+8

Need asap. solve for the following inequality