0.037
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Three. All non-zero digits are significant, all zeroes between other digits, and all digits to the right of the decimal. The reason for this is that if this is rounded off, it apparently is rounded off to the nearest tenth, otherwise the tenth place would not be shown. if it were rounded off to the unit, it would read 39, not 39.0 ■
111.0
Oh, dude, 9999 rounded off to three significant digits is 10,000. Yeah, I know, we're just moving that decimal point around like it's nobody's business. So, if you're into significant digits and all that jazz, there you have it, 10,000.
1,040 to 3 s.f., or 1,040 (3 s.f.) or 1,040.
7.0001 rounded off to 4 significant figures is 7.000