exam Maths Puzzle Numerical Ability

What is -3 (2y - 9) + y simplified?

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exam Other Question

(rad)x-1)=x-3 i know I square them first but then i get lost. please help me. an amusement park purchased equipment form a manufacturer for $42,000 minus trade discounts of 30/20/15.

Show me how to caculate the trade discount on the purchase. Please.