exam Maths Puzzle Numerical Ability

2) $5000 is invested for 10 year compounds quarterly, at the end of the 10 years the amount as grown to $11,500. What is the annual interest percentage rate to the rounded to the nearest 100th?

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exam Other Question
(3x - 1)^2 if z1=2+j, z2=3+j and z3=j3

what is the equivalent impedance z if

1/z= 1/z1 + 1/z2 + 1/z3 ?? this was a question given to us for homework and it was not in any text book