Five years ago the total sum of ages of father and son was 40. The ratio of their present age is 4:1 what is the present age of the father

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

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.

In which form is the following function written? y = - 2(x – 3)(x + 5)