Question

Sorry it doesn’t go bigger but please help.

Answer 1

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

$a(n)=42+(n-1)\cdot(-2)\\\\\boxed{a(n)=42-(n-1)\cdot2}$

Answer B.