Dimitri paid the same price for five different stocks. The table shows the change in the price of the stocks since he purchased them. A 2-column table with 5 rows. Column 1 is labeled Stock with entries A, B, C, D, E. Column 2 is labeled Change in price with entries negative 4.15, positive 1.30, positive 8.75, negative 10.10, negative 3.55.

What is the magnitude of the change of Stock A?

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)

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it is b)

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