10-32 High-low, regression. May Blackwell is the new manager of the materials storeroom for Clayton Manufacturing. May has been asked to estimate future monthly purchase costs for part 4696 , used in two of Clayton's products. May has purchase cost and quantity data for the past 9 months as follows: Estimated monthly purchases for this part based on expected demand of the two products for the rest of the year are as follows: 1. The computer in May's office is down, and May has been asked to immediately provide an equation to estimate the future purchase cost for part 1696 . May grabs a calculator and uses the high-low method to estimate a cost equation. What equation does she get? 2. Using the equation from requirement 1, calculate the future expected purchase costs for each of the last 3 months of the year