Simplify the expression (3 - 4i)(1 + 5i) - (2 - i). Show your work please! I have the 21 + `12i but I need to show my work, thank you!

What is the approximate circumference of the circle shown below?

Which ahows the graph of the solution set of 6x+4y< 12

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.