You pay 3.3 cents per minute for long-distance phone calls on your phone. your phone bill is $3.40. write and solve an equation to find the number of minutes m of long-distance calls you made. the choices are
m = 3.40; 103 minutes
= 3.40; 11 minutes
= 3.3; 83 minutes
3.3m = 3.40; 10 minutes

450 is the final answer! : )

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: