.000380 is 380 millionths, ppm is to millionths what % is to hundredths. If you now move the decimal two places to the right to conver to a percentage, then 380 ppm is approximately .04%, and thus, CO2 makes up .04% of the air (which is what I assume this question is refering to)
4 significant figures.
2 significant figures. However, 34001 would have had 5 significant figures.
It has 3 significant figures.
5 significant figures.
4 significant figures.
29.1% if you want it to the right amount of significant figures
2099/3500 * 100 = 59.97% to 4 significant figures
4 significant figures.
4 significant figures.
Ignore the millions :- 0.8 as a percentage of 49.87? 1.60% to two significant figures
There are four significant figures in .007001
There are four significant figures in 0.1111.
There are two significant figures in 0.025.
8 significant figures. Actually, the zeros to the left of the 7 are not significant. There are 2 significant figures.
13.3 x 100/375 = 3.55% to two significant figures.
Five significant figures.
Three significant figures.