Which of the following proportions could be used to convert 3,600 feet into miles? 3,600ft/ 1 mi = 5,280 ft/x 3,600 ft/ 5,280 ft = 1mi/x x/ 3,600 ft = 5,280 ft/ 1 mi 3,600 ft/ x = 5,280 ft/ 1 mi mi= mile

3600ft/5280ft= 1mi

Step-by-step explanation:

that's the correct answer

answer: options?

step-by-step explanation:

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: