Cubes of all numbers are Irrational Numbers, if they're not natural
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none 3 x 3 x 3 = 27 4 x 4 x 4 = 64 ---------------------------- Every number has a cube root, just most of them are not whole numbers, so every number between 30 and 50 is a cube. If you meant what the perfect cube numbers (ie the cubes of whole numbers) between 30 and 50, then the answer is, as above, none.
The square root of 32 approximates to 5.66
30 is an integer and not a fraction. However, it can be expressed in rational form as 30/1.
30 is an integer and not a fraction. However, it can be expressed in rational form as 30/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have accomplished that.