A bag contains 10 marbles: 2 are green, 4 are red, and 4 are blue. Tom chooses a marble at random, and without putting it back, chooses another one at
random. What is the probability that the first marble is blue and the second is green? Write your answer as a fraction in simplest form.

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.

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota

Analyze the diagram below and complete the instructions that follow. how to find tan