exam Maths Puzzle Numerical Ability

Please help with this one i keep getting stuck.
(i+6)(3i-2)

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exam Other Question

y= - sqrt(x-1)+1

graph and find the domain and range A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture?