Find f^-1(x) for f(x)=1/x^3 and state whether or not it is a function? (TIMED)
A. f^-1(x)= -1/3x + 2/3 : function
B. f^-1(x)= 1/3x - 2/3 : not a function
C. f^-1(x)= 1/3x + 2/3 : function
D. f^-1(x)= -1/3x - 2/3 : function