"cbrt" is acceptable abbreviation of cube root, although it is much easier to write "^(1/3)", which is the one-third power, or the cube root. They are mathematically identical.
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2 cube root 24 plus 3 cube root 81 is 18.7492444
the index of a cube root is 3.
the cube root of 64 =4
The cube root of 240 is: 6.21446501
The cube root of 7 is 1.91293118