Revenue from single-day ticket sales at a local amusement park can be modeled by the function y=-x2+11x+42 and revenue from season pass sales can be modeled by the function y=-5x+81, where x represents the number of months past January and y represents the total revenue in tens of thousands of dollars.

Algebraically, determine after how many months the revenue from single-day ticket sales will equal the revenue from season pass sales. (The first time it occurs)

How much revenue will they have earned at this point in time from single-ticket and season pass sales?