The width of a rectangle measures (8.4a + 7.5) centimeters, and its length measures (7.4a - 4.4) centimeters. Which expression represents the perimeter, in
centimeters, of the rectangle?
15.9a + 3
O 31.8a + 6

15.8a + 3.1
31.6a + 6.2

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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:

answer: idk

step-by-step explanation: