Answer: The answer is 29, because that 29 would be the outlier of the numbers.
Step-by-step explanation:
Cylinder and cone you use pi.
I will assume that this question is about scientific notation (also assuming that the first number is 3.4*10^2), where you can arrange the numbers by the exponent of the 10, so from least to greatest:

,

, 435, and
-6 is the answer that you want