Giải hệ phương trình tuyến tính sau bằng phương pháp Gauss-Jordan {2x1 - x2 - x3 = 4
{3x1 + 4x2 -2x3 = 11
{3x1 - 2x2 + 4x3 = 11

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18

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.

Construct the graph that models the given situation