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There is no operator between the two numbers in scientific notation.
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Since the numbers are already expressed in the form a x 10ⁿ, 2 x 104 and 4 x 10-12 are already in scientific notation.
1.276 x 104 km or 1.276 x 107 m
Scientific notation of 12 000
12 in Scientific Notation = 1.2 x 101
It is: 3.427*10^12 in scientific notation