1 of them.
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The quantity of 400 m has one significant figure unless specified otherwise. If it is written as 400. or in scientific notation (e.g., 4.00 × 10²), it would indicate three significant figures. Without additional notation, the trailing zeros in 400 are not considered significant. Therefore, it is typically interpreted as having one significant figure.
2300.m has four significant figures.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
There are 2 significant figures in this measurement.
Two. When multiplying or dividing the answer is rounded to the fewest significant figures in the given measurements. 0.55 has only two significant figures, so the answer can have only two significant figures.