Answer:
-1572864
Step-by-step explanation:
You want the 19th term of the geometric sequence with first term -6 and common ratio -2.
N-th term
The n-th term of a geometric sequence is ...
an = a1·r^(n-1)
where a1 is the first term, and r is the common ratio.
Using the given values of a1 and r, the 19th term is ...
a19 = (-6)·(-2)^(19-1) = -1572864
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