PLEASE HELP AND HURRY WILL MARK BRAINIEST IF CORRECT

Sketch one cycle if the cosine function y=2cos2theta

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 (%)

Luke wants to reduce the area of his rectangular garden by 1/4 the expression 14/w can be used to represent this change. what is another way to write this expression?