Explain how u can turn 5,400 in hundreds

The actual width ( w) of a regulation soccer field is 90 meters (m), and the actual length is 120 meters (m). a coach has drawn a scale model of the field on a blackboard. if the longest side of his drawing is 18 cm, how long is the other side of the drawing( w)?

Need on this one asap im almost done with this subject

The quadratic function h(t)=-16.1t^2+150 choose the graph representation