exam Maths Puzzle Numerical Ability

Using the graph of y=-x^2+4x+5. what is the equation of the line of symmetry for this graph?

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exam Other Question

Place any 16 positive integers(using no integer more than once) into a 4x4 square so that the sum of the 4 numbers of each row or column equals 44. please help. factor the expression 16x^2-12x-10 thanks for the help