exam Maths Puzzle Numerical Ability

How do you rewrite this expression using the indicated property?

(x+7)+3,Associative Property

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exam Other Question

Part of $20,000 is invested at 5% and the rest at 3%. How much is invested at each rate if the total income is 4.5% of the total investment? The number -12.6 or in fraction form negative 63 over 5 is between two consecutive odd integers. What is the product of these two integers?