Two parallel lines are crossed by a transversal.

horizontal and parallel lines b and c are cut by transversal a. at the intersection of lines b and a, the bottom right angle is 50 degrees. at the intersection of lines c and a, the top left angle is y degrees.
what is the value of y?

y = 30
y = 50
y = 110
y = 130

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.