Here's the question you clicked on:
savannah.r.dixon
how many signficant figures does the following number have? 0.000310
oi. sig figs. hate em. http://www.usca.edu/chemistry/genchem/sigfig.htm <-- see this link for reference i think it's three.
only 3. Leading zeroes are never significant. the zeroes in front of "3" are leading zeroes trailing zeroes are significant IF they follow a decimal point
only 3 because the leading zeros are never significant