Correct each number to 3 significant figures and 3 decimal places:

1. 2.7846
2. 0.1572
3. 3.2094
4. 0.07325
5. 0.15076
6. 0.02039
7. 0.78101
8. 3.2994
9. 254.1627
10.0.0009258
11. 7.8196
12. 0.009638

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:

the radius is 2 times the diameter.

step-by-step explanation: