exam Maths Puzzle Numerical Ability

What is the answer to x-y/x(to the power of -1)- y(to the power of -1)?

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exam Other Question

Okay,

9 over B-2 plus 9 over B+ 2 The cost of producing a number of items x is given by
C = mx + b, in which b is the fixed cost and m is the variable cost (the cost of
producing one more item).
(a) If the fixed