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.
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460. (the period/decimal point is necessary; otherwise 460 would be considered two significant figures)
42 has two significant figures.
687 to two significant figures is 690.
23.43 rounded to two significant figures is 23.
Rounded to two significant figures it becomes 1.0e4