exam Maths Puzzle Numerical Ability

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The demand and supply equations for a certain item are given by
D = -5p + 40
S = -p^2 + 30p - 8
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exam Other Question

is x-1 a factor of -3x^4+x^3-5x^2+2x+4 A certain kind of wood weighs 0.85 g per cubic cm. An 18cm by 12cm by 10cm block of that wood is floating in water. Approximately what weight of water does the block displace?