Which is NOT true? 8 + 7 = 7 + 8

8 = 12 - 4

11 + 4 = 7 + 8

8 + 7 = 13 - 2

8+7=13-2

Step-by-step explanation:

8+7 = 15

13-2 = 11

8+7 = 13 - 2

Step-by-step explanation:

8+7 is 15 and 13 - 2 is 11 so that should be your 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:

1.30

step-by-step explanation: