A year has 12 months so 1 month = 1/12 year. t = 3 months = 3/12 year = 1/4 year
An irrational number/value is one you cannot express in terms of a ration, or a fraction, it cannot be written as fraction
now 291.87... is simple, two decimals, so you use two zeros at the botom and end up with

and boom, there you are, a fraction, nice and dandy
now, let's see the first one -√(127) well, low and behold, 127 is a prime number, and and thus is has no two factors that'd serve as root, so, there's no rational root that'd give that, that makes it irrational
V=L X W X H
1,296=6 x w x 24
1,296=144 x w
1296/144=w
9=width
36 should be added to both sides because 12/2= 6 then you square 6 to get 36 and that should be it.