B is one.
A < C and D are rational
Im thinking about E. It looks like a recurring decimal at first sight but I think its irrational.
Answer:
133.42 hours is how long he's have to work to reach the monthly income
At sea level, the pressure is 1013, that's when the altitude is at 0, sea level, let's see

so, the inital amount is 1013, when t = 0,

now, to check the atmospheric pressure at 4000, simply set t = 4000, to get A.
Answer:
x = 21
Step-by-step explanation:
3x = 16 * 4 = 64
x = 64/3
x = 21