HELP ASAP!!!

An accounting firm must perform five company audits next month. Three accountants are available to complete the jobs, but each can only work on one audis The payment (in thousands of doliars) each accountant will recelve is based on the audits helshe performs, as shown bolow. There are some audits the some accountants can't conduct (in the table, these are shown as "..') The firm wants to minimize the total payment that has to disburse to complete the selected audits. A. Explain what the decision variables are. B. Show the algebraic equations or standard form model of this problem (you DONT have to solve it.)