"Syəqen pue sdoidej'suindwoo dozysəp sijas doys v zł
7
Here is a probability scale.
It shows the probability of each of the events A, B, C and D.
A
B
C
D
(a) Write down the letter of the event that is certain.

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'm sorry mate, but i am not seeing any figures. i am unable to solve this for you.

step-by-step explanation: