A mining company owns two mines. These mines produce an ore that can be graded into two classes: regular grade and low grade. The company must produce at least 325 tons of regular-grade and 540 tons of low-grade ore per week. The first mine produces 5 tons of regular-grade and 18 tons of low-grade ore per hour. The second mine produces 20 tons of regular-grade and 9 tons of low-grade ore per hour. The operating cost of the first mine is $21,000 per hour, and the operating cost of the second mine is $9000 per hour. The first mine can be operated no more than 37 hours a week, and the second mine can be operated no more than 34 hours a week. How many hours per week should each mine be operated to minimize the cost? Note that the ALEKS graphing calculator can be used to make computations easier. First mine: hour (s ) Second mine: hour(s) X