If f(x)=8x+3 what is the value of x when f(x) =19

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

Answer question above and explain each step : )

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?