PLZ HURRY IT'S URGENT!! Which number is irrational?

0.13

2/3

√4‾

√5‾

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

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.

Solve for n? [tex]z = \frac{3}{4} mn[/tex]