HELP HELP-
1) -2/5 x 3/7 + 7/5 x 3/7

(the / here is used for representing fraction)

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 (%)

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Find the maximum value of p= 4x + 5y subject to the following constraints :