Question

29849 (3 sig. Fig )

Answer 1

3 sig fig means 3 significant figures.  This means that only the first 3 digits in a number are above 0.
The first 3 digits in 29849 are 298 and, because 4 is less than 5, the 8 is not round up, and remains the same.  The 4 and the 9, however, become 0. 

The answer is 29800