Answer: This is a geometric sequence, because each term is obtained by multiplying the previous term by a constant ratio. In this case, the ratio is -2.
To find the 9th term, we can use the formula for the nth term of a geometric sequence:
a_n = a_1 * r^(n-1)
where:
a_n is the nth term of the sequence
a_1 is the first term of the sequence (9)
r is the common ratio (-2)
n is the term number (9)
Plugging in the values:
a_9 = 9 * (-2)^(9-1) = 9 * (-2)^8 = 9 * -256 = -2304
So the 9th term of the sequence is -2304