exam Maths Puzzle Numerical Ability

what type of property is the following
-1.7+15=15+(-1.7)
I think it is associative

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exam Other Question

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^2-3.69x+9.524, what is the price $900 and goes up by 17%, what is the new price?