How many terms are in the arithmetic sequence 7, 1, −5, …, −161?

hint: an = a1 + d(n − 1), where a1 is the first term and d is the common difference

27
28
29
30

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.

Find the area of the regular hexagon if a side is 20 cm.

How can you tell when x and y are not directly proportional?