exam Maths Puzzle Numerical Ability

Tutor can you help me with this equation please?

I need to simplify this expression.

15x^2-x-2/3x^2-5x-2

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exam Other Question

what is the remainder when 7^2004 is divided by 100? Steven invests $2000 into a GIC which will double every five years, wheras Dana invests $1000 into a GIC which will triple evry three years. How many years will pass before they have the same amount of money?