Ahelicopter was -28.4 feet below sea level in a canyon and ascended 35.2 feet. what is the location of the helicopter after it ascended?

Solve the system of equations. y= 2x y= x^2 - 15

Ineed i been stuck on this question since yesterday

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 (%)