Data table Requirement 1. Which of the preceding costs is variable? Fixed? Mixed? Explain. Requirement 2. Using the high-low method, determine the cost function for each cost. Begin by selecting the general formula that represents the linear cost function for each cost. Maintenance Health insurance Shipping costs Cost function Maintenance y= Health insurance y= Shipping costs y= Requirement 3. Combine the preceding information to get a monthly operating cost function for the Sherman Corporation. Monthly operating cost = Requirement 4. Next month, Sherman expects to use 320 machine hours, have 85 employees, and ship 9,300 units. Estimate the total operating cost for the month. Monthly operating cost =