Tickets to a concert cost $50 for each orchestra seat and $40 for each balcony seat. If 1,500 tickets were sold to earn $69,000, how many orchestra-seat tickets were sold?

There are several unique characteristics of qualitative research that make it distinct from quantitative research. describe the aspects of qualitative research and the elements of design that contribute to the rigor of the work. what actions of the researcher can compromise the integrity of the findings?

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

Can someone me and do the problem plz so i can understand it more better