4cubed plus (2/3) to the -1 power times 4+ 8 to the 0 power?

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?  

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?