Where does the parent function f(x) = cos(x) start on the y-axis?

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Ineed in figuring out this problem.

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 (%)