Answer:
2 x 10^16
Explanation:
1.3 x 10^-4 x n = 2.6 x 10^12
(1.3 x 10^-4 /1.3 x 10^-4) x n = 2.6 x 10^12/1.3 x 10^-4
n = 2 x 10^16
When dividing, subtract your exponents.
12 - (-4) = 16
Answer: the third one
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