Oh, dude, so like, 502.6548246 to 3 significant figures is 503. Because, you know, we're just rounding it off, making it look all fancy and stuff. Who even needs all those extra decimals anyway, right?
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0.000729512 in scientific notation written to 3 significant places is 7.30x10-4.
Significant figures. For example, 3.4953729 to 3 significant figures would be 3.495
Three. This refers to the number of significant digits AFTER the decimal point.
0.2551
500