The only coins alexis has are dimes and quarters. her coins have a total value of $5.80. she has a total of 40 coins. which of the following systems of equations can be used to find the number of dimes, d, and the number of quarters, q, alexis has. explain your choice. a.) d + q = 5.80 40d + 40 q= 5.80 b.) d + q = 40 0.25d + 0.10q = 5.80 c.) d + q = 5.80 0.10d + 0.25q = 40 d.) d + q = 40 0.10d = 0.25q = 5.80

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?