exam Maths Puzzle Numerical Ability

two times a number plus 1 is 21

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exam Other Question

which is an equation of the axis of symmetry of the grapd y=x^2-4x+1? 16 divided by (-2) times (-4)over
2to the third power times 4
This is crazy to me just when I thinnk I have it something is wrong. Thanks so much for all your help and time.