Last year the six grade enrollment at Main middle school was 612 students this year the enrollment is 489 students which best represents the percent change in the enrollment at Main middle school from last year

20.1% or 20% depending on your teacher

Step-by-step explanation:

612-489=123    123/612= 0.200980392   round to 0.201   move decimal two spaces to the right to make it a percent 20.1% or 20% depending on your teacher.

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:

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