I pick the third possible answer, was I correct?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals