Brandon has $50 in his savings account. he plans to deposit $20 into his savings account each month. select all expressions that could be used to find the amount of money brandon will have in his savings account after x months of making deposits. a. 20x - 50. b. 20x + 50. c. 20 + 50x. d. 20 + 50 + x. e. 50 + 20x.

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: