Answer:
d. geometric, - 2
Explanation:
An arithmetic sequence is a sequence in which the next term is obtained by adding/subtraction of a constant to the previous term.
A geometric sequence is a sequence in which the next term is obtained by multiplying/dividing the previous term by a number.
Given the sequence
[tex]\begin{gathered} -2,4,-8,16,\ldots \\ \frac{4}{-2}=-2 \\ -\frac{8}{4}=-2 \\ \frac{16}{-8}=-2 \end{gathered}[/tex]The sequence is geometric and the common ratio is -2.
