If y varies directly as the square of x and y=-54 when x=9, then y=-1 1/3 when x=6

The appalachian trail is a hiking trail that passes through the appalachian mountains. three members of a teen hiking group hiked a section of the trail. the hikers stopped at a rest area and equally shared 3 4 gallon of water. how much water did each person get?

Pls! does anybody know a shortcut for answering these types of questions in the future?

Which compound inequality could be represented by the graph?