Cecil has a credit card that uses the adjusted balance method. For the first 10 days of one of his 30-day billing cycles, his balance was $340. He then made a purchase for $290, so his balance jumped to $630, and it remained that amount for the next 10 days. Cecil then made a payment of $150, so his balance for the last 10 days of the billing cycle was $480. If his credit card's APR is 19%, which of these expressions could be used to calculate the amount Cecil was charged in interest for the billing cycle?

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:

it is x equals 3   plese mark me really need it

step-by-step explanation:

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