Jason is buying burgers and fries for his family. Each burger costs $6 and each order of fries costs $4. He has a total of $36 to spend. **a. Write an equation that represents this situation using x to represent the number of burgers purchased and y to represent the number of fries purchased.

** b. If Jason bought 2 burgers, how many fries did he purchase in order to spend all of his money?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?