Starts off at 7 ends at114688, subtract them, 114681. Now there are 8 terms so subtract 1 because you're starting from the beginning, that leaves 7. Now divide 114681/7=16,383 difference per point,
Now 1st pt is 7
2nd is 16390
3rd is 32773
4th is 49156
5th is 65539
6th is 81922
7th is 98305
8th is 114688
Now add these= 458780
