exam Maths Puzzle Numerical Ability

Solve using elimination: 3x - 6y = 9
4x - 8y = 4

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exam Other Question

How many cubic yards of earth must be removed in digging an artificial lake 15 feet deep,if the level bottom is a rectangle 180 feet by 20 feet and the top is a rectangle 216 feet by 24 feet?Show solution and formulas. Given a= x(^1/2)-4x(^-1/2). What is the value of 1/a^-2???