What is -13+33/17? (33/17 is a fraction)

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Savannah had 40 iris blooms last year this year she had 15% more iris blooms how many more hours blooms did savannah have this year