Is the piecewise graph a function? check using the vertical line test.

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 (%)

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?