<span>They are finite sums of expressions of the form where a is a constant, x is the variable and k is a non-negative integer</span>
The answer is 4. If you add 4 to any of the x values, it equals the y value next to it
1. x=-3 y=4 2. x=5/2 y=15/2 3. x=9/5 y=-36/5 4. x=-2 y=1
