answer

1. Sara benefited the farmers in North Carolina by cutting quantity of strawberry. Reducing supply of strawberry production raise the income of the farmers if assumed that demand for strawberry is inelastic.

2. Demand for factory worker is quite elastic, so driving out immigrants won't make a big difference because it can be replaced by women and children who are more likely to be underpaid.

3. (a) is the answer because Ice cream and yogurt are complements

4. (a) this is not in the textbook, but kind of a non-sense question. But using midpoint formula we just get numbers such as 1.2 or - 3 No units!