Math help please show work due soon thanks

What properties allow transformation to be used as a problem solving tool

Which expression converts 45 degree to radians

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 (%)