I need help on these

12

Step-by-step explanation:

This is a "absolute value"

We use this to make a number or the result of an equation positive.

Example: |2 - 8| = |-6| = 6

You solve the equation first and then turn it positive, if the number is positive, just remains de same.

In your case, it is just a negative number, you just have to turn it positive.

|-12| = 12

It is simple.

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:

the correct answer is a.) bc< mn 5 stars if this you : )

step-by-step explanation: