exam Maths Puzzle Numerical Ability

"no objects that sink in water are chunks of ice, and no objects that float in water are things at least as dense as water. accordingly, all chunks of ice are things less dense tha

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Given x + iy form, write in polar form: negative radical 5 + i I tried to solve this problem in many ways, please help
problem (2.2^2)^3 =
my answer 2.2=4
(4^2)=16
16^3=4096
then
(2.2^2)^3
(4.2)
(8)^3
512