The area of a rectangle is 70 square inches and the length of the rectangle is 3 inches longer than the width.

the area of a rectangle is found by multiplying the length times the width.

which equation models this situation?

3w = 70

w(w+3)=70w(w+3)=70

w + 3 = 70

w + 3w = 70

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:

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step-by-step explanation: