exam Maths Puzzle Numerical Ability

If x - 10 = 35, which property of equality for real numbers justifies that x = 45. show the use of this property

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exam Other Question

6-[2+7/3-(2.3-5)] , 7 to third power minus 2/3(13.6+9)4 if x= 4 and y= -2, the value 0f 1/2xy^2 is? (^2 means squared).
Is the xy squared or just the y and how do you solve it?
(this problem is Question 17 on the Math A, August 2006 Packet @regentsprep.org).