Atrail mix is made up of peanuts that cost p dollars per pound and dried fruit that costs d dollars per pound. a blend of 1 match 2pound of peanuts and 3 match 4. pound of dried fruit costs $6.50. a blend of 1 match 3 pound of peanuts and 1 match 4 pound of dried fruit costs $4.50. which matrix equation can be used to solve for the cost of 1 pound of peanuts and the cost of 1 pound of dried fruit?

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?