Write a function to represent the geometric sequence 6, 18, 54, . . . .(1 point) Responses f(x)=3(6)x f left parenthesis x right parenthesis equals 3 left parenthesis 6 right parenthesis superscript x baseline f(x)=6(3)x f left parenthesis x right parenthesis equals 6 left parenthesis 3 right parenthesis superscript x baseline f(x)=3(6)x−1 f left parenthesis x right parenthesis equals 3 left parenthesis 6 right parenthesis superscript x minus 1 baseline f(x)=6(3)x−1