Simply and state any restrictions on the variables. Help please 1. m+7/m^2+4m-21
2. x^2-16/9-x•x^2+x-90/x^2+14x+40
3. 2b^2‐12b/b+5÷b-6/b+5​

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

Describe what moves you could use to create the transformation of the original image shown at right

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 (%)