A family just bought a puppy and wants to fence in part of the yard. The fenced-in area is a rectangular section of the yard that is separate from all other structures on the property. The family has purchased 70 feet of fencing. What function models the area of the pen?

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:

i will with my problems and all the other things that need to   be on by the way

step-by-step explanation: