Please solve any four questions of these 10 questions

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 (%)

Ming says that 0.24 > 1/4 because 0.24= 2/4. which best explains mings error

What is the difference between the equations of a vertical and a horizontal line?