1. A local business kept track of their sales each month for two years. They used this data to create a sales model for their business. The model is y = -0.25x^2 +
6x + 40 hundred dollars per month.
i. Determine when the maximum sales value occurs
ii. Determine the actual maximum sales.
iii. Also, use a graphing calculator to determine when the sales value would be zero
in context of the problem.