Which of the following is a geometric sequence?

A is an geometric sequence cause it is multiplying by -3 as it continues. So, as you are seeing below:

3*-3=-9

-9*-3=27

27*-3=-81

And for the other options , some of them were increasing and some were decreasing. They all are arithmetic sequence cause they all include common difference except A. A includes common ratio and that's why it's an geometric sequence.

step-by-step explanation:

i think there was a typo. you wrote pat brings 3 quarts of ice-cream to the party. each serving of ice-cream is 1 6 quart. how many total servings of ice-cream does pat bring to the party? i think the bold is supposed to be 1/6. so 1 quart of ice cream = 6 servings. 6 * 3 = 18.