Two fathers and two sons sat down to eat eggs for breakfast. they ate exactly three eggs, each person had an egg. explain how. (riddle)

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?

How can i differentiate this equation?

Can someone me with this? i’m not sure what to put for my equations.