exam Maths Puzzle Numerical Ability

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Think of any fundamental operation (addition, subtraction, multiplication, division, exponentiation) on an irrational number, which results in:
-A rational n

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exam Other Question

Graph the linear equation in two variables: y=-6x-5 THE VOLUME OF A CYLINDRICAL TANK IS GIVEN BY THE FORMULA V=pie h r^2 WHERE h IS THE HEIGHT OF THE CYLINDER AND r IS ITS RADIUS. FIND THE VOLUME TO THE NEAREST TENTH OF A CUBIC FOOT OF A CYLINDRICAL TANK THAT HAS A RADIUS OF 3 FEET AND A HEIGHT OF 5 FEET.