Which of the following best explains the graph as it approaches the horizontal asymptote at y=60? O The average annual cost of the reſrigerator is at least $60. O The average annual cost of the refrigeralor is al most $60. If the refrigerator lasts a long time, thic average annual cost will eventually be $60. 0 The longer the relrigerator lasts, the closer the averagci annual cost will be to $60. e​

add an image

step-by-step explanation:

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: