4. solve using cramer's rule. you must show work for each determinant! leave all answers as fractions.
1-2x +6y +32 =-2
3 5x +4y -2 =2.
1-7x +y +27 = 3

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.

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6

Laura read 1/8 of a comic book in 2 days. she reads the same number of pages every day. what part of the book does she read in a week