Answer:
The answer to the chart is y=x-1
You need further explanation like are your trying to find the missing angle like you would do 180-65-60=55
One way to do it is to find an explicit formula for the
th term.
The pattern suggests that the
th term is given by
, and so the fifth term is
.
Another way to do it would be to plug
into the recursive formula to find
, then
, and so on.