1. x=24
2. r=9
3. w=33
4. n=19
You have to use the keywords that register to the problem
The forward differences for this data is 1, 1, 1, 1, 1, 1 (since 10 - 9 = 1, 11 - 10 = 1, etc). Since we only need one iteration of differences, a linear polynomial will fit the data exactly.
Answer to this problem is D