Isabella has already read 1 page, and she knows she can read 12 more pages during every additional hour she spends reading. In all, how many hours of reading will Isabella have to
do this week in order to have read a total of 49 pages?

4 hours I think.

Step-by-step explanation:

She already did 1 page so we can take away 1 from 48. It takes her one hour to read 12 pages and she needs to read 48. So 48 divided but 12 is 4 hours.

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:

20

step-by-step explanation: