Miembros: Melody

Theresa21T:
e^-247
I'm not sure how to put it into my calculator because when I do it get 0, but the answer on the assignment is 5x10^-108. Any one know?

Hi Theresa,
when I put it my calculator I got 'error'
When I put it into the Web2.0calc I got 0

The answer is clearly not 0 but it is so tiny that the calculators cannot cope.

e ^-247 = 1 / e ²⁴⁷ The denominator is a huge number so the whole fraction is miniscule.

I am not sure if I should be giving it to you since this site is very kindly sponsored by web2.0calc but there is another online calculator that will give you the answer that you seek.
http://www.wolframalpha.com/input/?i=e%5E%28-247%29

Just put your question in there and you will get your answer. Remember, you may need to put the -247 in brackets.

Melody10 dic 2013

+118690

Guest:
andriannaneighly:
20134/2 *34-45+98+=????????

use a calculator

hi adrianna,
I wouldn't make fun of you.
Maybe the reason the calculator gave you an error is the + sign just before the equal sign. That doesn't make sense because there is nothing more added.
so the question becomes
20134/2 *34-45+98=

The / means 'divided by'

The * means multiply

Does that sort out all of your problems ?

Melody10 dic 2013

+118690

Lily:
38
15
56? thank you melody and sorry teachr for getting the wong answr

Hi Lily,
I think that you have the right idea except that 8+5 does not equal 16.
Could you fix it up for me please.
Thankyou.

Melody10 dic 2013

+118690

I would love to be. Thankyou.

Melody10 dic 2013

+118690

I am good, thank you for asking.
How are your reindeers?
Does Rudolf still have a cold. His nose looked very red last time I saw him!

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

That was a bit rude of me. I should not have assumed that you wanted me to answer. Sorry.

Melody9 dic 2013

+118690

Guest:
3x^3 - 2x = 0

Since this is a cubic answer (power of 3) there will be at most 3 answers.
This is just a bit of background knowledge that it would be good for you to know.

With this sort of question it is important that you start with 0 on the right hand side and everything else on the left. But your question is already set up this way. So this is just another bit of background knowledge.

Now your question
3x ³ -2x = 0

first factorise out the x so that you have 2 factors (only the x is easy to factorise out).

now you know that if two numbers multiply together to get 0 then one or the other or maybe both have to be equal to 0.
It is the same with algebraic factors that multiply to give 0
So you have to put each factor = 0 (and solve each resultant equation) to get all the possible values x
I will tell you now that there are 3 answers.
You see if you can find them.

If you get stuck, or you would like me to check your answer then please post again.
If you get stuck I would like you to show me the working that you have managed.

Happy calculations!

Melody9 dic 2013

+118690

hedehodo:
who am i

When I saw your name, I thought of a hedgehog but maybe I am wrong.
Are you a spikey character or can you at least give us a hint?
Maybe you are a bushy character like a hedge?
Or maybe you are a hod for carrying bricks?
I just do not know. The answer is a mystery.

Melody9 dic 2013

+118690

mirolala:
7+ln(8x)=22-2ln(x)

Hi Mirolala
This is a difficult log question you have here

You must be able to do at least something with it.
You will need to split the log(8x) up. Using log identities

http://en.wikipedia.org/wiki/List_of_logarithmic_identities
this might be useful if you have forgotten them.

Take all the terms with x onto one side and the rest on the other side of the equal sign.
And go from there
I got x=(e ⁵)/2
but I will admit I did it quickly and I haven't checked the answer.

Melody9 dic 2013

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