XD Plz do 2 slides (4 problems)

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 (%)

Which expression is rational? 6. , square root two, square root 14, square root 49

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie