Suppose a trough with trapezoidal cross sections is formed by turning up the edges of a 30-inch-wide sheet of aluminum (see figure) . Find the cross section of maximum area. 
Definitions:
Intravenous Therapy
The administration of liquid substances directly into a vein as a therapeutic treatment.
Crime Rate
A measure of the incidence of crimes committed in a particular area or country over a specified period of time.
Expected Time of Return
The projected time when an individual or item is anticipated to return to a specific location or status.
Police Escort
A service provided by the police for ensuring the safety and security of individuals or groups during transportation or when moving through potentially hazardous areas.
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