9. A large aquarium tank of the shape of an open-topped reclangular prism is to measure 5 metres from front to back and have a volume of 300 m3 is to be built. The base, the ends and the back of the aquarium are to be made with slate and the front is to be made with glass. The cost glass is 4 times more then the cost of slate per square metre. Determine the exact and simplified dimensions that will minimize the total cost to build this aquarium. L= V120 M [3] W = 5417 M Glass (Front only) 5 m X