Identify the expression as a numerical expression or variable expression. for a variable expression, name the variable. 1 x 12

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?  

Does the point (1, sqrt 7) lie on circle shown.

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost