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.
4 of them.
5 of them.
2
Three significant figures.
2 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).
There are three significant figures in the sum of 18 plus 52.1 because each number has three significant figures and adding them together maintains the precision of the original numbers.
100 has one, 150 has 2, 250 has 2.