During the second week of basketball training, Joseph practiced his free kicks 20 minutes less than twice the time he practiced in the first week. If he practiced m minutes the first week, which expression represents the number of minutes he practiced the second week.

2m - 20

Step-by-step explanation:

Given that:

First week minutes = m

Second week minutes = (2 * first week minutes - 20)

Second week = 2m - 20

Therefore, the expression for the number of practice minutes for the second week is :

2m - 20

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:

step-by-step explanation: