[ 1.2 x 104 ] is the scientific notation.
The 'standard' notation is [ 12,000 ].
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12 in Scientific Notation = 1.2 x 101
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.
6.8 * 10 to the -12
999000000000 in scientific notation is 9.99*10^11
1.276 x 104 km or 1.276 x 107 m