Two of them
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It has 2 significant figures. However, the fact that it is given as 2300 mm and not as 230 cm suggests that it is, in fact significant to 4 figures.
4 significant figures (because this number has a decimal, start counting at the first non-zero digit from the left...so count 2300).
How many significant figures are in 13001kg
3 significant figures.
3 significant figures.