Please help

(02.06 MC) A real estate company balances the books for its business on the first day of each month. It hopes to sell houses every other day of the month. Th average number of houses, S, the company sells each day, t, is represented by the inverse of the function S-1 = _12 + 41-5 12 - 71 +6 Which equation represents the average sales each day for the real estate company? 61 + 5 OS= 1 - 1 OS= 61-5 1+ 1 OS = 1+ 5 1 -6 Os - 5 1 + 6