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To subtract these two numbers, we need to rewrite them in the same scientific notation format.
4.66 x 10^-5 = 0.0000466
7.34 x 10^-7 = 0.000000734
Now we can subtract these two numbers:
0.0000466 - 0.000000734 = 0.000045866
Therefore, 4.66 x 10^-5 - 7.34 x 10^-7 = 4.5866 x 10^-5