Solve this system of equations
-2x+5y+4z=-4
-5x-y+z=-1
2y+2z=-4

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.

Y= a(x-3)squared-1 what is the value of a

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20