1. What is the explicit rule for the geometric sequence? 120, 40, 40/3, 40/9, 40/27, ...
2. What is the recursive rule for the geometric sequence? 10, −80, 640, −5120, ...

Thank you to anyone who helps!
The first one is:
Multiply each term by 1/3, so you have:
120, [120x1/3] =40, [40x1/3]=40/3, [40/3x1/3]=40/9...........and so on.
The second one is:
Multiply each term by 8, so you have:
10, [8x10]=80, [80x8]=640, [640x8] =5120........and so on.
The EXPLICIT formula for the first one:
r = 1/3 a1 = 120
an = a1 * 1/3^(n1)
The RECURSIVE formula for the second one is
r = 8
an = a(n1) * (8)