Im finna ask a question

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

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 (%)

Find the value of x to the nearest tenth.