CPhill

Sounds like you have a computer virus, rosala

Go here and download malwarebytes....don't worry...it's safe!!

http://www.malwarebytes.org/

Once you've downloaded it.....run a scan...it will usually catch Trojan Horses, etc.

I use Adblock Edge to block ads...but I think you might have something else going on....

Thanks, Alan, for that answer.....!!!

4 play neither

x play volleball only

9x play both tennis and volleyball

And (30 -9x) play tennis only

So we have

4 + x + 9x + (30 - 9x) = 36

34 + x = 36

x = 2 = those who play volleyball only

So 9(2) = 18 play tennis and volleyball

And (30 - 9(2))  = (30 -18) = 12 play tennis only

And

4 + 2 + 18 + 12 = 36

Two examples may help more than a detailed explanation.

Suppose we have .000003567

Move the decimal one place to the right of the first non-zero digit and write:

3.567 x 10^-6    where "6" is the number of places we moved the decimal to the right

Now suppose we have 3567

Again, move the decimal one place to the right of the first non-zero digit and write:

3.567 x 10³      where "3" is the number of places we moved the decimal to the left

So....moving the decimal to the right results in a negative exponent on 10. And moving it to the left results in a positive exponent on 10.

Hope that helps.

I don't think the calculator on this site has the capability to do this, and I'm not sure what type of calculator you're using, so I can't tell you how to do this......(maybe look at your manual???)

However, here's a pretty good website, WolframA;pha, that will calculate an inverse of an invertible square matrix........

http://www.wolframalpha.com/input/?i=inverse+matrix&a=*C.inverse+matrix-_*Calculator.dflt-&f2={{5%2C4%2C9}%2C{3%2C2%2C1}%2C{2%2C1%2C3}}&f=MatrixInverse.invmatrix_{{5%2C4%2C9}%2C{3%2C2%2C1}%2C{2%2C1%2C3}}

I don't know if that helps you, or not.

We'll call it a tie, Aziz......

The cook...nobody cooks breakfast in the afternoon...

What's harder to learn, rosala.....English or Hindi  ???

I already did......see my first post.....the bus driver was walking......

Ah...I think your answer is correct, Aziz!!