book Maths Puzzle Numerical Ability

How do I simplify a radical expression? That includes the product property and the quotient properties.

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book Other Question

(log12) X + (log12)(X-1) = 1 steve devine invested $7200 for one year,part at 10% annual interest and the rest at 14% annual interest. His total interest for the year was $960. How much money did he invest?