30(30 – x) = 540 what is the value for x?

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 equation 2(x-4) = 4(2x + 1)?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2