Optimization; elasticity of demand 3.4 – Calculus FTW - Deep Insight into Solving Calculus Problems Review

I need help with this chapter and I don’t think This app is going to help.. it needs an update that correspond with the book I’m using which is: calculus for business, economics, and the social and life science. The brief edition eleventh edition.. is there anyone that can help me please
Review by Burn skull on Calculus FTW - Deep Insight into Solving Calculus Problems.