'add_' returns the sum of all the arguments passed to it, normalized to 2 decimal places.


'subtract_' returns the difference of the arguments passed to it, starting with the first argument and subtracting all subsequent arguments, normalized to 2 decimal places.


'multiply_' returns the product of all the arguments passed to it, normalized to 2 decimal places.


'divide_' returns the quotient of the first argument divided by all the subsequent arguments, normalized to 2 decimal places.


'power_' returns the result of raising the first argument to the power of all the subsequent arguments, normalized to 2 decimal places.


'sqrt_' returns the square root of the first argument, normalized to 2 decimal places.


'log_' returns the base-10 logarithm of the first argument if one argument is provided, or the logarithm with base as the second argument if two arguments are provided, normalized to 2 decimal places.


'ln_' returns the natural logarithm of the first argument, normalized to 2 decimal places.


'lcm_' returns the least common multiple of all the arguments passed to it, normalized to 2 decimal places.


'gcd_' returns the greatest common divisor of all the arguments passed to it, normalized to 2 decimal places.


'remainder_' returns the remainder of the division of the first argument by the second argument, normalized to 2 decimal places.


'choose_' returns the number of ways to choose 'r' items from 'n' options without regard to order, normalized to 2 decimal places.


'permutate_' returns the number of ways to arrange 'r' items out of 'n' options, normalized to 2 decimal places.