A-LevelMathematicsDifferentiationOct/Nov 2010Paper 1 Q1010 Marks
The diagram shows an open rectangular tank of height h metres covered with a lid. The base of the tank has sides of length x metres and 5/4x metres and the lid is a rectangle with sides of length x metres and 5/4x metres. When full the tank holds 4 m³ of water. The material from which the tank is made is of negligible thickness. The external surface area of the tank together with the area of the top of the lid is A m².
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