You're saying 5/6 + 7/8 has the greatest possible value. How do you know for sure?

Plz help me

Simply 8x squared + 5(7x squared- x) - 2x =

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 (%)

Give me the equations of two lines that have the same slope but are not parallel.