what the domain and the range of this equation?

a). f(x)=1/2x-4
b). 6x-9y=-18
c). 4x-y=4

Find the solution set of this inequality. enter your answer in interval notation using grouping symbols. |8x-4| ≤ 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.

How do you find the circumfrance of a circle?