Posted by Francesca on Monday, October 10, 2011 at 12:52pm.
How do I solve for negative modular arithmetic?
Here is an example: 45 mod 13 = 7, but how?

Math  Mgraph, Monday, October 10, 2011 at 12:56pm
52 mod 13 = 0
45(52)=7

Math  MathMate, Monday, October 10, 2011 at 12:56pm
You can add multiples of 13 until you get a positive number, example:
45+4(13)=45+52=7
or even
45+10(13)=45+130=85≡7 mod 13

Math  Francesca, Tuesday, October 11, 2011 at 11:12am
Thanks for your help!
Also, I am kind of confused about finding the value of x.
Example: 9x ≡ 1 mod 10
How do I solve this?

Math  Anonymous, Thursday, June 28, 2012 at 10:41pm
how long will it take for a 10,000 investment to grow to 15,000if it is compounded continuously at 5 %
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