Find the measure of arc ZY

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 are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Is the power produced directly proportional to the wind speed, give reasons for your answer?