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29 792 458 in significant figures is 29 790 000, and written in scientific notation is 2.979*10^7
It depends upon how you got to the 12, for example: 28.6 - 16.6 = 12.0 Because each of the numbers that was used to get to the 12 had 3 significant figures, you should write the 12 with three significant figures also. However: 29 - 17 = 12 In this case, each of the numbers that was used to get to 12 had only 2 significant figures, so use only 2 significant figures in the 12.
It is: 11+13+17+19+23+29 = 112
0.0066
There is no decimal point in the number in the question so it is not possible to answer the question.