Melody

$${\mathtt{1}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{\left(-{\mathtt{14}}\right)}{\mathtt{\,-\,}}{\mathtt{7.24}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{\left(-{\mathtt{4}}\right)} = -{\mathtt{0.000\: \!723\: \!999\: \!999\: \!99}}$$

And all this time I thought the answer was nine million divided by two and a quarter million.

How could i get it so wrong?  

Thanks rosala,

That was some really good advice.

This the exact  address that Rosala is sending you to

Good one anonymous!

Hi anonymous,

I have no idea which is correct.  As the question asker it is up to you to have enough knowledge to know which answer to accept and which to reject.

Maybe Rom or someone else will come along and help you with this task.

Well, I have checked using a hand held casio calculator and Wolfram|Alpha calculator and

Alan has checked using Mathcad.

It is correct to 12 significant figures.  The last five digits have some rounding error.  For most people's purposes this error would be insignificant.

$$1.5a/2=\frac{3a}{4}$$   

  (because 1.5=3/2)

@@ End of Day Wrap - Friday30/5/14   Sydney, Australia   Time 20:40 pm 

hi everyone,

Our great answers were today provided by chilledz3non, Kitty<3, CPhill, Rom, Alan, Heureka, Reinout-g, Bertie, GoldenLeaf, Themightyalgol and all-them-marvel-feels.  Thank you all.

Themightyalgor joined up yesterday (maybe today) We welcome you to web2.0calc forum and we hope that you find this site helpful and fun!

-----------------------------------------

Here are some posts that some people may find interesting.

(I've included no comic ones today - that's a little sad)

Manipulating logs always causes problems for people (Thanks for the demo Alan)

Rom has assumed compound interest , compounding yearly at 2.3% per annum

BUT really these are just very sensible assumptions on his part.

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It depends on whether it is compound interest or simple interest.

and

is it 2.3% per annum or per some other time period.

and

If it is compound interest, how often is it compounding.

There is no answer,    $$x^2+6x$$   cannot be simplified.