Doctors treated a patient at an emergency room from 2:00 P. M. to 7:00 P. M. The patient's blood oxygen level L (in percent) during this time period can be modeled by L = −0.270t² + 3.57t + 80.6 2 ≤ t ≤ 7
where t represents the time of day, with t = 2 corresponding to 2:00 P. M.
Use the model to estimate the time (rounded to the nearest hour) when the patient's blood oxygen level was 92%.

PM

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: c. is your answer

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