11) In a recent survey, 300 students were asked about the type of pets they
own. The results showed that 131 students own dogs, 71 students own cats,
7 students own goldfish, and the rest do not own pets. What percent of
students do not own pets?

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:

it's

360/29

step-by-step explanation:

answer: 12   they all have at least 28 days

step-by-step explanation: haha