3. Shoe sizes are marked differently in many countries. In Japan, shoe sizes are 16 more than the size in the United States. In Korea, shoe sizes are 224 more than the size in Japan. Determine the function of the U. S. size of a shoe in terms of the shoe size in Korea. What is the U. S. shoe size of a shoe that is 250 in Korea?

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation:

5: 20

step-by-step explanation: