I need help please and thank you

A =28.26 ft^2

Step-by-step explanation:

We need to find the radius.  The radius is 1/2 of the diameter

r = d/2 = 6/2 =3

A = pi r^2

A = pi (3)^2

A = pi 9

Using 3.14 for pi

A = 9*3.14

A =28.26 ft^2

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:

step-by-step explanation:

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