The 3 and the 2.
5 significant figures.
Rounded to two significant figures, 7.42 grams is approximately equal to 7.4 grams.
There are 3 significant figures in '4.50g'
Three of them.
4 of them.
302.5 grams
302.05 grams
0,000 000 32 has only two significant figures (3 and 2).
32
4
5
302.05 grams