exam Maths Puzzle Numerical Ability

I have worked part of this problem, now I am stumped. How do I write sqrt of -108 as an imaginary number? The prime factors I came up with are 3*3*3*2*2.
Thank you so much

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exam Other Question
Mr. Adams buys a bag of apples and a bag of pears for a total of $14.00. There are eight pounds of fruit in all. The apples cost $1.50 per pound, and the pears cost $2.30 per pound. HOw many pounds of pears did he buy? . Find the slope of the line that passes through the points (2, 3) and (5, 8).