Tính giá trị biểu thức :A=
biết tana=3/5

The sum of two numbers is 86, and their difference is 20. find the two numbers

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?  

A50% increase followed by 33 1/2% decrease