Melody

Thanks Ginger, it makes more sense now.

You have not responded to your last answers yet.  

Some good manners can go a long way. 

twistedwhyami,

Guest spent time looking at your question and asked you to verify the information.

Instead of thanking guest for their time and verifying the info, you just gave a thumbs down.

Do you really think this was an appropriate response. 

Why would anyone bother trying to help you if you are abusvie in return.

fyi   I also think that you should verify the info in your question.

How many books were there?

How much money did each one cost?

multiply.

Send a polite private message to a moderator asking for it to be unlocked.

Make sure you include the address in a link.

You are a member so you can do this..

If you were a guest you could do the same thing but it would have to be in a public post. (which is less likely to be seen)

20130118 = 

12^2=144= 0 mod 8

therefore 12 ^ anynumber greater than 2 is also 0 mod 8

so   

     \(20130118_{12}\;\mod8 \\ = 18_{12}\mod8\\ =20_{10}\mod10 \\ =4\)

ok thanks 

I give up :)

Square root of 12

3^2=9   4^2=16  so it is about half way between between  3 and 4.  If I estimated at this point I'd say 3.5

3.5^2=12.25  that is too big but very close

3.45^2=11.9025  to small

So to one decimal place it is 3.5

You can do the others yourself.