exam Maths Puzzle Numerical Ability

roise's palm pirates, a manufacturer of electronic organizers, estimates that when x hundred palm pirates are made, the averages cost per unit is given by C(x)=0.4x^2-3.68x+9.524,

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Can someone help me on this problem?

I need to identify the property that is used.

4 * (3 + 2) = (3 + 2) * 4

Is it Associative property or Associate property of addition?

Thanks,
Sher instructions:

Graph in a coordinate plane
17. y<2x^2-4x+1

i have no idea how to simplify nor graph..