Since total number of marbles r 22, then the denominator is 22 also. When Jonathan puts back the red marble aft the first round, this means with replacement so there's no change in denominator for the second round.
You have been given the information 2 hour per week 8 week period So, to find out how many hours of television you can watch, multiply 8 by 2 = 16 hours of television in a 8 week period. Hope this helps!!