exam Maths Puzzle Numerical Ability

3x^2 + 2x^2 - 7

I think the answer is -2x^2

I am trying to Siplifying expressions

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8x^2-200y^2 To hire a chain saw costs a fixed charge plus a daily amount. To hire the chain saw for 6 days costs �22.50 and to hire itfor 10 days costs�32.50. How much would it cost to hire th