exam Maths Puzzle Numerical Ability

What tpye of polynomial sequence has a common difference at D2? Is it linear,quadratic,cubic, or quartic?

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exam Other Question

Solve each of the following by graphing
2x+y=8
2x-y=0
find the distance between the poionts of intersection of the line with equation y=2x+1 and the parabola with equation y=x^2-4x+6.