An office supply store sells boxes of 7 pencils for $0.63 and boxes of 11 pencils at $1.10. Which is the better buy?

The better buy is the box of 7 pencils each costing .09 versus .10 for the box of 11 pencils.

7/.063=9 cents per pencil

11/1.10=10 cents per pencil

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Miss Hawaii

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: