Answer
$3000, -3000, 3000, -3000, 3000, -3000$
Work Step by Step
Write the first six terms by multiplying by the common ratio $-1$ to get the next term, starting at 3000.
$3000, -3000, 3000, -3000, 3000, -3000$
Because we are multiplying by a negative, the terms alternate between negative and positive.