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Answer:
156000 - 3 significant figures
Explanation:
zeros in decimal numbers before the FIRST non-zero are always insignificant.
ex: 0.005 has 1 significant figure cause the other zeros are insignificant.
zeros in non-decimal numbers that has trailing zeros are insignificant. (unless they are found in between two non-zero numbers)
ex: 10500 has 3 significant figures becoz the trailing zeros after "5" are insignificant and the one in between 1 and 5 is significant.
correct me if i'm wrong! :))