exam Maths Puzzle Numerical Ability

please help me simplify these expressions using imaginary numbers...

3 to the sqrt of -27 and 4 to the sqrt of -64

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exam Other Question

If the length of the hypotenuse of a right triangle is 24 meters and the length of one of its legs is 12 meters, find the length of the other leg. Round to the nearest tenth, if necessary. graph this equation y=-1/3x+1