You are building a rock wall for a flower bed along your 38-foot long driveway. You want the wall to
be one-half of the length of the driveway with an
absolute deviation of at most 6 feet. Write and
solve an absolute value inequality that represents
the possible lengths of the wall.

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?