3.2 cm
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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.
Because density expressed in two significant figures depends on your accuracy of your measurements of mass and volume to calculate as well as any variables that you are expected to use.
2 of them.
Three significant figures: two before the decimal point and one after.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.