book Maths Puzzle Numerical Ability

Which property of the real numbers is illustrated by the following statement?

7 � 3 = 3 � 7

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book Other Question

Subtract the lower polynomial from the upper one.

1) 6x+9
-2x+4
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2) 2x2y-5xy2+2
-x2y+2xy2+2
----------- what is the formula to calculate 52 dimes and nickels to equate $4.50?