Annalise earns $4 an hour walking pets in her neighborhood. she evaluates the expression 4h, where h represents the number of hours, to find the amount she earns. can any number be substituted for h? explain ( plz answer ! )

Yes. Because h is however many hours she worked. so sometimes she may only do 1 hour, the next week she may do 20. So any number could be put in this equation.

Hope this helps:)

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:

72 is the answer to this problem