6/7 at the power of 2 value

PLZ BE HONEST I SPENT 75 POINTS ON THIS

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

The radical equation 2+√2x-3 = √x+7 has a solution set [x= a0} and an extraneous root x = a1.

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 (%)