Pine bluff middle school is having its annual spring fling dance, which will cost $400\$400$400dollar sign, 400. the student treasurer reported that the dance fund has $75\$75$75dollar sign, 75 left over from last year. each ticket to the dance costs $4\$4$4dollar sign, 4.

let t represent the number of tickets sold. write an inequality to determine how many tickets must be sold to pay for this year's dance.

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?