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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

Simplify the following, leaving your answer in standard form.

I have solved it but had different solution from what the book has, I need some assistance.

1) 0.81 * 10^-5/2.25 * 10

2). 0.0048 * 0.81 * 10^-7/ 0.027 * 0.04 * 10^6

Both number one and two are in a 'square root sign'

Please, I would be much obliged if you produce your steps here.

Thanks in advance.

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

What were your answers?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

1). I had 6.0 * 10^-15

And

2). I had, 6.0 * 10^-9.

*Last edited by EbenezerSon (2013-08-11 22:09:07)*

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

Okay, 1) looks like this?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

Yes. But all are in a square root.

Sorry! the denominator is 2.25 * 10^7

Forgive me.

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

So we have:

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

Right!

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

You were close I am getting 6 x 10^-7

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

Please can you provide the steps?

Thanks.

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

Do it by pieces, what is

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

= 10^(-5-7)=10^-12.

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

Very good.

Now what is .81 / 2.25?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

= 0.36 *10^0

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

Leave out the 10^0, it is 1. We do not show multiplication by 1.

Now combine the two answers.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

0.36 * 10-12

= 0.6 * 10^-6

= 6.0 * 10^-7

It looks I was confused by the root.

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

Very good. It is awful making a human being do such calculations. We have machinery for that nowadays.

Is this 2)?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

Yes, Bobbym.

I just want to become used to them, cos in no time I will be teaching others.

Now, I had the same answer for the second question.

I owe you some thanks. :-)

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

That book has a sense of humor at least. I am getting the same answer as 1).

I owe you some thanks. :-)

No thanks required.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

Yes I tried to solve it once again and now I have the same answer as the first one, The root was my main problem, but now I have known how to go about that.

Thank you very much Bobbym.

God bless you!

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

Hi;

You are welcome. I am going to take a break, see you in a bit.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**EbenezerSon****Member**- Registered: 2013-07-04
- Posts: 510

Okay.

I will return getting to nıght time.

I know only one thing - that is that I know nothing

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,816

Hi;

Sorry for the delay but I needed an hour or so nap.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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