exam Maths Puzzle Numerical Ability

Can -4w(w^2+4w-5) be factored?

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exam Other Question

Write an indirect proof for the following Given and Prove statements.
Lines a and b are drawn with transversal t. Lines a and t intersect and one angle formed is named angle 1. A Freeport McMoRan projects that in 2010 world grain supply will be 1.8 trillion metric tons and the supply will be only 3/4 of world grain demand. What will world grain demand be in 2010?