exam Maths Puzzle Numerical Ability

Is the folowing an example of a function: Explain why or why not
(2, 4) (3, 9) (-2, 4) (-3, 9)

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exam Other Question

Find the solution of the exponential equation, correct to four decimal places.
e^-4x=6
69.72=68.9257x + 70.9249(1-x)