exam Maths Puzzle Numerical Ability

Simplify: (25)1/2(27)-1/3
note- the 1/2 and -1/3 are exponents

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can you help with this? use the remainder therom to evaluate P(x)=-4x^3+x^2-2x+7, for x=-2. I came up with 47, am i correct? thank you. A grocer wants to mix together some cashews costing $8 per kilogram with some Brazil nuuts costing $10 per kilogram. The grocer wants to sell 12 kg of the mixture for $8.50 per kil