Need help finishing this last question for a math test

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -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.