Its basically just subtracting from one another
for example, 6-6 is 6
or -4-3= 7
The shape of this graph is
I think the y intercept is 3.5
This is an arithmetic sequence (graph is a line), so function:
a(n) = First term + (n-1) * Common Difference
Here First term = 42 and Common difference = 34 - 36 = -2 so
Answer B.