How to get selected dropdown list value

Well that didn't show the HTML coding very well at all. I'll try it without the left caret on each line.:
div class="row"
div class="col col-30">Placement:
div class="col col-30">
select ng-model="SelectedItem.Placements" ng-options="placement as placement.Title for placement in Placements">
/div>
input type="text" ng-model="newMix.Placement" style="background-color:#ffd800"
ng-disabled="(SelectedItem.Placements !="Other")>

                /div>