What is the product of the coordinates of the midpoint of a line segment with endpoints at $(1,1)$ and $(-7,5)$?
That means the midpoint has coordinates $\left(\frac{1+(-7)}{2}, \frac{1+5}{2}\right)$. Simplifying, I get $\left(-3, 3\right)$. I get $(-3)(3) = -9$. 