Answer
$\Delta$ $H_{mix}$ is the largest negative number.
Work Step by Step
$\Delta$ $H_{mix}$ has to overcome the positive values of $\Delta$ $H_{solute}$ and $\Delta$ $H_{solvent}$ to make the overall reaction exothermic (we know it's exothermic because $\Delta$ $H_{soln}$ = -37kJ/mol) so $\Delta$ $H_{mix}$ must be the largest negative number.
