Question 1 Based on the measures provided in the
diagram, determine the measure of the angle 0.
(You may assume that point A is the center of the circle
and that DC is a diameter.)
80°
D
(Figure may not be drawn to scale.)
A 40°
B. 45°
C. 50°
D. 100°

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)

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