If z^2+1/z^2=11 , find the value of z^3-1/z^3,using only the positive value of z-1/z

How do you answer this question? (step by step)

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

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?