Help please its overdue

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 (%)

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

Plot a point at the y-intercept of the following function on the provided graph. 3y=-5x+7 20 points