exam Maths Puzzle Numerical Ability

Evaluate

f(-2/3) if f(x) = x/2

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exam Other Question

How do u do monomials? here is some examples of an monomials.......(2e over 3)with the exponet 2 out side the (). solve using matrix methods

x + 4y = 8
2x + y = 9

Thank you for your help.