Enter the explicit rule for the geometric sequence. 120, 40, 403, 409, 4027,  a(n)=

The explicit rule is .

The explicit rule is of the form
,
where a₁ is the first term and r is the common ratio (what we're multiplying by).

The first term of our sequence is 120.

The common ratio can be found by dividing a₂ by a₁:
40/120 = 1/3

We then plug those into our explicit rule.

It would be the second one because it passes the vertical line test

The answer is all about the number 4