Which choice is the explicit formula for the following geometric sequence?

0.5, –0.1, 0.02, –0.004, 0.0008,

This means the common ratio between the terms in the sequence is , so you know the recursive formula is



which you can solve recursively to find an explicit formula in terms of .



So the explicit formula is

Od. 130 degrees because if you add them together you get the 130