Which expression is equivalent to 3^2 x 3^-1

Exponents =

3² x 3^-1 equivalent to 3

why?

let's simplify,

in formula :

when 3¹ is equivalent to 3

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents