What is the value of 3xy+5x-y over 2 if x=12 and y=8

Which of the following represents the range of the graph of f(x) below

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 (%)

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,