Find the area of a circle with a circumference of 31.42 centimeters.

c = 2(pi)r = 31.42cm

2(3.14)r = 31.42cm

6.28r = 31.42cm

r = 31.42cm / 6.28

r = 5cm

A = (pi)r^2

= (3.14) (5)^2

5x5 = 25cm

25x3.14= 78.5cm

the area equals 78.5cm

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:

range is infinite on both x and y axis positive and negative

step-by-step explanation: