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5/11 would be considered a rational number because it doesn't have infinite non-repeating numbers to the right of the decimal point. The number below is what 5/11 would look like as a decimal.

0.45454545454 (this pattern goes on forever)

You can use the following eaquation to find the square root of ten.

sqrt(10)

Now, you can remove the ten and replace it with whatever number you like. Example Below

sqrt(39)

If I were you, I'd guess and check to find the right answer.

First, try it with a yearly interest rate. If you check this and it doesn't work, try different rates like monthly, once every six months, once every two years, etc.

I'm sorry, but I personally don't know of an easier way to do this problem.

3.14159265359 (at least the first 12 digits)

Probably not. How would we count votes?

If the sales tax is 2% and the item you are buying is 10 dollars, then you find the total by doing the following:

10.00 * 1.02 =

0.02 is 2% sales tax.

10.00 is ten dollars.

and 1.00 is the starting price without sales tax.

Sure, below is a link to a multiplication table.

http://www.vaughns-1-pagers.com/computer/multiplication-tables/times-table-12x12.gif

Well, yes, Obscure, I agree. I just wish the person needing help would tell what difficulties they are having with the problem apposed to just stating the math problem they were given.