book Maths Puzzle Numerical Ability

The distance seen in miles from a height of h feet on Earth is d = square root 3h / 2 . If we can see approximately 35 miles from the top of the Cityspire in New York, estimate i

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14/a^2 - 1 + 1/a-1 = 3/a+1 please help me solve this problem
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x-4
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