A pound of mangoes cost $4,and a pound of grapes cost $3. You spend a total of $21 on two these fruits. If you buy 3 pounds of mangoes , how many pounds of grapes did you buy?

Factor this polynomial completely x^2-64

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.

Asystem of equations has 1 solution. if 4x-y=5 is one of the equations , which could be the other equation ?