Posted by l on Friday, September 7, 2012 at 1:04pm.
Any help would be appreciated!
What is 38.896/5.1 + 509.15 to the correct number of significant figures?
516.78
What is (154+8446.1)/54 to the correct number of significant figures?
159.261
Thanks!

Math  Kevin, Friday, September 7, 2012 at 6:46pm
Rules for counting significant figures are summarized below.
Zeros within a number are always significant. Both 4308 and 40.05 contain four significant figures.
Zeros that do nothing but set the decimal point are not significant. Thus, 470,000 has two significant figures.
Trailing zeros that aren't needed to hold the decimal point are significant. For example, 4.00 has three significant figures. 
Math  Anonymous, Saturday, September 8, 2012 at 7:44pm
I understand that, but this is different because it's a complex number.