book Maths Puzzle Numerical Ability

14/a^2 - 1 + 1/a-1 = 3/a+1

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book Other Question

Evaluate the following

1 -2 3 -4 5
-2 3 0 5 -1
2 -2 -3 3 -3
-2 3 -3 5 -6
6 -1 3 -7 9

Thank you 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