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Exponents....almost got it! NEED HELP

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Senior | Next Rank: 100 Posts
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by relaxin99 » Wed Sep 24, 2008 11:43 pm
5^21 * 4^11 = 2 * 10^n


I work it out but i always get caught at the end and stuck...thanks guys
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Senior | Next Rank: 100 Posts
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by relaxin99 » Wed Sep 24, 2008 11:44 pm
the question asks what is n, sorry....so solve for n
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Re: Exponents....almost got it! NEED HELP

by Morgoth » Thu Sep 25, 2008 12:50 am
relaxin99 wrote:5^21 * 4^11 = 2 * 10^n


I work it out but i always get caught at the end and stuck...thanks guys
5^21 * 4^11 = 2 * 10^n

5^21 * 2^22 = 2* 10^n

5^21 * 2^21 * 2 = 2 * 10^n

10^21 * 2 = 2* 10^n

compare the two sides

n = 21
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