Kerry asked a bank teller to cash a $390 check using a $20 and $50 bills. if the teller gave her a total of 15 bills, how many of each type of bill did she receive?

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

Two numbers have a sum of -19. one number is x. what expression represents the other number?