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big test help im really stuck?

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Simplify the following complex number problems. the answers CANNOT have decimals

a: (4+√−4)+(−5+√−25)
b: (√(−25)−(4+i√16)
c: (−2i)(5i)(−2+i)
d. (4−i)²
e. 4−5i ÷ 7+9i
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