exam Maths Puzzle Numerical Ability

if x=-1 and y=2,what is the value of the expression 2x^3-3xy?

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exam Other Question

Kevin earned $165.00 interest for 1 year on an investment of $1500.00. At the same rate, what amount of interest would be earned by an investment of $2500.00?

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i am having a difficult time finding the answer to this problem. can you please help me? simplify [(6x-1)-2x]-[(12x-7)-(4x-5)]. thank you!