Five, two and five sig figs respectively.
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25.488000000000003
28.71
It depends how many significant figures you are after. 23.1 + 2.06 = 25.16Significant figures is like rounding.If I were to round it to 3 sig. fig. I would have 25.2If I were to round it to 2 sig. fig. I would have 25and so on. You only keep the numbers which keep the number similar to the original yet less accurate with less digits.
You count the number 5 as the first significant figure,7 the second, 6 the third. You then round the it up or down from the following number. As it it 0 you round down, leaving it as 6. A: 5.76
2700