Can you help please?

(4x + 3) - (5x-7)

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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.

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?