At this point, the plane started descending. As the plane turned, it’s altitude dropped from 3060 feet to 1650 feet above ground level. Calculate the angle of descent if the plane traveled 0.5 miles (c). (Note: the difference in altitude is 1390 feet) Round to the nearest 100th.

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?