exam Maths Puzzle Numerical Ability

can you please help me on solving this equation...

find the value of the polynomial x^3 - 4x when x = -2

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exam Other Question

Science and technology. Fungicides account for 1/10 of the pesticides used in the United States. Insecticides account for 1/4 of all the pesticides used in the United States. The r a coffee merchant has coffee beans that sell for $9 a per pound and $12 per pound. The two types are to be mixed to create 100 pounds of mixture that will sell for $11.25 per pound. How much of each type of bean should be in used in the mixture?