How many rectangular prisms can you make with 18 cubes

Which is the completely factored from of xy^3-x^3y

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 (%)

What is the slope of the line shown below?