Posted by Jack on Friday, October 12, 2007 at 6:31pm.
I don't have any specific problems I need help with, but I'm a bit confused about two things:
1) Where 2^x  1 = y, is x or y the Mersenne prime?
2) I have noticed that in some cases, such as 27 * 3, I can break the problem up and arrive at the correct result:
27 * 3 = 81
(20 * 3) + (7 * 3) = 60 + 21 = 81
Does this work in all cases? I'm having trouble finding a problem that isn't correctly solved this way, but in the past I have tried this and arrived at the wrong answer. Does anyone know how this works?

Math  bobpursley, Friday, October 12, 2007 at 6:46pm
2) it works in all cases.
(a+b)c=a*c + b*c is why this is true.
1) y is the Mersenne Prime. And, big news in that area, the first 44 are now known.
http://www.mersenne.org/

Math  Jack, Friday, October 12, 2007 at 7:52pm
I see, thanks. I must have been doing it wrong when it didn't work.
Answer This Question
Related Questions
 math  I'm a bit confused on the whole lesson on finding coordinates on a graph...
 Calc Derivatives  So, I have a bunch of derivative problems for homework and ...
 Science/ Social Studies  I need help with those two subjects. Please tell us ...
 English  Help:Please change show me anthing that I need to do, by placing the ...
 Fib. Number  I noticed someone else is having problems with the same problem ...
 Quick Science Question  I have a question. Is a Atwood Machine a suspended ...
 Geometry Proofs, HELP!!  I need help, I have a Geometry Exam on Monday. And I ...
 ENGLISH  Help:Please change show me anthing that I need to do, by placing the ...
 American History. Dealing with events of Germany!  Hi, i have no idea what to ...
 Math  Please simplify: Very confused, have many problems like this and need ...
More Related Questions