A bag contains 7 blue marbles and 21 white marbles. If a representative sample contains 3 blue marbles, then how many white marbles would you expect it to
contain? Explain.
Because the ratio of blue marbles to white marbles is 7:3 in the population, the
expected number of white marbles is times the number of blue marbles in the
representative sample. There should be white marbles.

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:

they are simplified

step-by-step explanation:

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.