exam Maths Puzzle Numerical Ability

Simplify:

-4 square root 27 + 2 square root 12

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exam Other Question

Roberto invested some money at 7% and then invested $5000 more than twe the amount at 9%. His total income for two investments was $3950. How much was invested at 9%? using the theorem what is the answer to a problem where triangle sides are 3.1, 8.7 and x