Mark orders food for a restaurant. he orders 5 times the number of pounds of chicken as he does beef, and he orders 4 times the number of pounds of fish as beef. the total weight of the food he orders is 3,600 pounds. how many pounds of each item does mark order?

Simplify the expression. -2/5(10+15m-20n)

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 (%)

I'm confused on this could anyone me and show me what i need to do to solve it.