Ihave a math test due today and its 9: 16pm my time (this test was due like 16 minutes ago)

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 (%)

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.