Which of the following is equivalent to the expression below for all values of x where the expression is defined?
13
x − 1
+
7
x + 1

F
20
x2−1

H
20x+6
x2−1

G
6x+20
x2−1

J
20x
x2−1

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.