9.5 + 3.1225i, and 9.5 - 3.1225i
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81 and 9 if you add them. 4 and 25 if you multiply them.
115
20
Add a 0 onto 100, or add 2 0's onto 10. Multiply by 10 = add a 0 Multiply by 100= add 00 Multiply by 1000 = add 00 Teachers prefere not to say 'add a 0'. This is like a cheat, and does not work for decimals.
Product = multiply.