⇒ The general formula of a geometric sequence is
where a is the first term and r is the common ratio, now in the given a which is 3 and the common ratio r which is 3.
to get the 10th term we use the same general formula

where
is the nth term that is then output and n is the place of the nth term in the general sequence.
For the 10th term we substitute 10 in the place of n and simplify to find the value of the output.

Now since we know which formula to use to get the 10th term we can substitute the known values of the variables to get the output .

goodluck