exam Maths Puzzle Numerical Ability

May I have some help evaluating this expression?

Evaluate the expression and write the result in the form a + bi.

sqrt(1/5) sqrt(-125

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exam Other Question

A triangular region has a perimeter of 66 meters. The first side is two-thirds of the second side. The third side is 14 meters shorter than the second side. What are the lengths of the three sides of the triangular region? Could you please help me with these two problems. 3x-y<6
x>1
y<3 I have