4*PLEASE ANSWER FAST VERY URGENT

The factorization of 8x3 -125 is (2x-5)(jx2 +kx+25)

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?  

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).