Answer:
Explanation:
From here, you plug in n = 10 to find the tenth terma = 9 = first term
r = -2 = common ratio
We multiply each term by -2 to generate the next term
The nth term for this geometric sequence is a*(r)^(n-1) which becomes 9(-2)^(n-1)
If you tried plugging in say n = 2, you should find that,
9(-2)^(n-1)
9(-2)^(2-1)
9(-2)^1
9(-2)
-18
9(-2)^(n-1)
9(-2)^(10-1)
9(-2)^9
9(-512)
-4608