Ruben brought 6 comic books for $21. what was the coast for 1 comic book?

21/6 = $3.50

I'm hellaaa smar

it would be 3.50 because 21 divided by 6 equals 3.5 but if you switch it to a money situation it would be 3.50

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:

a - base

b - exponent

so,