costs associated with manufacturing x products is described by:

C(x)=x^3-7x^2+18x+110

revenue for this level of manufacturing is : V(x)=3x^3-21x^2+84x+180

Profit = V(x)-C(x)

Calculate

1. expression for profit associated with manufacturing x items

2. how many items should be manufactured to minimise production costs

3. how many items need to be manufactured to maximise the profit