30 ! 1. which ratios form a proportion? use equivalent rations to test each pair a. 4/9, 2/3 b. 6/15, 9/12 c.12/16, 15/20 d. 18/20, 24/30 2.which ratio forms a proportion with 20/30 a. 16/24 b.10/20 c. 17/51 d.15/60 3.which ratios form a proportion? a. 9/17,27/50 b.12/35, 24/75 c. 15/55, 33/121 d. 12/35, 20/70

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Step-by-step explanation:

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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: