Does anyone get how to do this problem

Issof claims that the scale factor is 1/2. which statement about his claim is correct

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept

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 (%)