How to find vertical and horizontal asymptotes calculus?

The step function g(x) is defined as shown.what is the range of g(x)? ***answer choices in picture.

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 (%)

Me find the value of x each figure.