??

Can you do the partial derivatives? Please demonstrate.

Do you have a definition of "Own-Price Elasticity of Demand"? I suspect it has something to do with the p1-partial derivative?

Do you have a definition of "Unit Elastic"?

Do you have a definition of "Cross-Price Elasticity of Demand"? I suspect it has something to do with the p2-partial derivative?

Let's see where you are...