(x²y + 3x + 2) + (3x²+y) (xy+3x+2) + (3x²+y)

(xy+3x+2) - (3x²+y)

Pls help me with this equations

What is the slope of the line shown below?

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?  

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)