at a store 2000 cases of bottled water are sold each year at a uniform rate. it costs the store $7.50 per year to keep one case of water in stock. Each delivery costs a flat rate of $100. how often should the deliveries be scheduled to minimize the total cost while ensuring the inventory is never zero?

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

The answer is: y would equal 3 because if you simplify the equation then it would be y= 3x+9 and if you divide 3x and 9 by 3 it would equal 3. y= 3