7th Grade Math-Exponents

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I don't understand this at all! Please help!

Find the units digit for 7^197 without using a calculator. Explain how you found your answer.

  • 7th Grade Math-Exponents -

    guiuyjhvvujhkjkb;

  • 7th Grade Math-Exponents -

    5+3(16-20)+7

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