exam Maths Puzzle Numerical Ability

Given x delta y = x+y/x-y
8 delta w = 4/3
solve for delta w

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exam Other Question

Combine like terms.
6a2 + 4a + 5 + 3a2 + 7a � 2 x is between -2/3 and 1/3 what does the between mean i dont get this...