Use a formula to find the sum of the series 1+2+4+8+ ... + 1024 that has 11 terms.

8191
2047
4095
1535

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

41/2 - 1 1/3 what is the answer as a fraction?

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.