The Hernandez family and the Campbell family each used their sprinklers last summer. The water output rate for the Hernandez family sprinkler was 30 L per hour. The water output rate for the Campbell family’s sprinkler was 40 L per hour. The families used their sprinklers for a combined total of 45 hours, resulting in a total water output of 1600 L. How long was each sprinkler used

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:

x=6 and x=3

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step-by-step explanation: