I need super big help, what is the step by step method and the answer to this math problem 3+9(-2+7)

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.

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual 

What is the point slope form of a line with slope -5 that contains point (2,-1)