exam Maths Puzzle Numerical Ability

9 radical 7 - 4 radical 2 + 3 radical 2 + 5 radical 7

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2x^(2/3)*y^(4/3)/9x^(3/4)*y^(1/4) rationalize the denominator Telephoto lens. Use the formula 1/F=1/O + 1/I to find the image distance I for an object that is 2,000,000 mm from 250 mm telephoto lens.