exam Maths Puzzle Numerical Ability

Simplify

square root of -16 - the square root of 3 times the square root of 3 - the square root of -4 times the square root of -4 + 3i - 3i^2 + 3i^3

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exam Other Question

If an earthquake measured 5.9 on the Richter scale, what was the intensity of the earthquake? Use the formula M=log(A/Ao). With Current, a motorboat travels 60 mi in 3 h. Against the current, it takes 2h longer to travel 60 mi. Find the rate of the current.