Solve these mathematics problems and write only the answers

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Solve these mathematics problems and write only the answers.

The Topic is complex number. Sets on a complex number.

First question. Given the complex numbers z1=3-10i, z2=15+5i. find Re(z1.z2).

Second Question. Given the complex numbers z1=12+4i, z2=3+i

Find lm(z1/z2).

Third Question. if Z=1-sqrt 3 i, then Z power5 is equal to?

Fourth Question: find all values of the root 3 sqrt 8i.