Marta's starting annual salary is 24,900. at the beginning of each new year, she receives a $2700 raise. write a recursive formula to find marta's salary f(n) after n years. what will marta's salary be after 4 years? a. f(n)=f(n-1)-2700; 35,700 b. f(n)=f(n-1)+2700; 33,000 c. f(n)= 2700f(n-1); 33,000 d. f(n)=-2700f(n-1); 35,700

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: