Answer:
Presumably the first graph solely based on its shape.
Ok -13*-8 is 104.
-8*18q is 144q.
Combine an you get:
144q+104
When you round; you round down if the number in the selected column is below 5 and you round up if the number is 5 and above.
Thus; if you apply this to your question:
784,072 then round up and you get 790,000
