exam Maths Puzzle Numerical Ability

simplify.

9 sqrt(6) - 9 sqrt(2)

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exam Other Question

The period of vibration P for a pendulum varies directly as the square root of the length L. If the period of vibration is 3 seconds when the length is 36 inches, what is the period when L=5.0625 inches? Sam invested $7,500 for one year, part at 12% annual interest and the rest at 10% annual interest. His total interest for the year was $890. How much money did he invest at 12%.