Shannon Corporation wants to find an equation to estimate some of their monthly operating costs for the operating budget for 2021 . The following cost and other data were gathered for 2020 : (Click the icon to view the cost and other data) Read the requirements. 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. Now determine the cost function for each cost. (Enter all values in the same format as the general linear formula. If an input field is not used in the equation, leave the input field empty; do not enter a label.) 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 Shannon Corporation. Monthly operating cost = Requirement 4. Next month, Shannon expects to use 420 machine hours, have 90 employees, and ship 8,700 units. Estimate the total operating cost for the month. Monthlv ooeratina cost =