Math Is Fun Forum

SlowlyFading

Member

Registered: 2012-06-12

Posts: 149

Exponents and Scientific Notation

Well, in the other lesson I'm working, I got 4 out of 20 wrong.

I don't understand them and am unable to work it out.

The problems;
simplify the following exponential expressions:
2. (x-3)5

9. Divide the following numbers using scientific notation: (4 x 102)/(1 x 103)

19. Estimate the amount of juice in a typical orange juice carton in liters.
(That's a strange question, huh?)

20. Estimate the weight of a small can of soup in grams.
(Again, strange question if you ask me.)

Anyway, I need the correct answer and the steps you used so I can (hopefully) understand it myself!

Thanks!

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I'm just here to get some help with an online math course I'm taking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Exponents and Scientific Notation

Hi;

Please use the exponentiation operator,"^".

Is that 10^3? I think it might be but you have to be clear when doing math.

Is that (x-3)^5 ?

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

careless25

Real Member

Registered: 2008-07-24

Posts: 560

Re: Exponents and Scientific Notation

EDIT: Removed, to not confuse OP

Last edited by careless25 (2012-08-13 02:04:31)

Bob

Administrator

Registered: 2010-06-20

Posts: 10,621

Re: Exponents and Scientific Notation

hi SlowlyFading,

9. Divide the following numbers using scientific notation: (4 x 102)/(1 x 103)

You can split this into two divisions:

Click on the Latex so you can begin to learn how to display exponents properly.

19. Estimate the amount of juice in a typical orange juice carton in liters.
(That's a strange question, huh?)

Yes, a bit strange.  I think this is just to get you to have an idea about how big a liter and a gram are.

You're not expected to get an exact answer, just get a result that is about the right size.

So have a look in the cupboard or search on-line for fruit juice and see what sizes are sold.

My morning fruit juice comes in a one liter pack.

20. Estimate the weight of a small can of soup in grams.

Again you could look in your cupboard or on-line.

I've helped someone with this problem before.  But they had a choice of answers, two of which were close and we picked the 'wrong' one.  I felt this was a very unfair question because of the possible answers on offer.  Multi choice is OK for a question like this if five out of six answers are obviously wrong.

I wonder if you are doing the same course?

http://www.mathisfunforum.com/viewtopic … =15902&p=1

NOTE TO EVERYONE:

The first question is on that sheet is

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

SlowlyFading

Member

Registered: 2012-06-12

Posts: 149

Re: Exponents and Scientific Notation

Thanks Bob Bundy!
As for #2, I figured that out myself. It was super simple and I had already gotten the correct answer it was just written wrong.
Oh and bobbym, you were correct. I'll make sure I do that in the future.

It looks like zee f and I are taking the same course! I had all those same questions!

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I'm just here to get some help with an online math course I'm taking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Exponents and Scientific Notation

Hi;

It looks like zee f and I are taking the same course! I had all those same questions!

She is a very good student. I hope to see her soon.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.