3
43.3
4 of them.
5 of them.
2
Three significant figures.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
The real answer is 33.443 but since 12 is the number with the least significant figures your answer will be 33
43.3
It has three.
2
4 of them.
5 of them.
Three significant figures.
There are 5 significant figures, the six plus the four zeroes. The zeroes are significant figures due to the inclusion of the decimal - with no decimal there would only be one significant figure (the six).
18 + 52.1 is 70.1 there are 3 sig figs
100 has one, 150 has 2, 250 has 2.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer which in this case is 270.9