exam Maths Puzzle Numerical Ability

(-4xto the second y)2
__________
-12xy (to the -4)

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exam Other Question

An alloy of tin is 16% tin. How much tin must be added to make 820 lbs of alloy that is 18% tin? Answer to the nearest tenth. Solve each system by the substitution method. Indicate wether each system is independent, inconsistent, or dependent.

2x - 3y =12
3y - 2x = -12