A company that makes hair-care products had 4,000 people try a new shampoo. Of the 4,000 people, 32 had a mild allergic reaction. What percent of the people had a mild allergic reaction?

0.8%

Step-by-step explanation:

if you divide 32 by 4,000 you get 0.008 and that as a percent iss 0.8%

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:

probably the last option

step-by-step explanation: