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marliani.majid:
the weight of the cat and mouse is 10kg, the weight of the dog and mouse is 20kg, the weight of the cat and dog is 24kg, what is the weight of the cat, dog and mouse?

Hi Marliani,

First you write the equations.
C+M=10 (1)
D+M=20 (2)
C+D=24 (3)

now make M the subject of equations1 and 2
Since you have M= as the Left Hand Side of t both of them, you can put the two right hand sides as equal to one another.
Now you can make D (or c) the subject of the new equation.

Now solve the new equation and equation 3 simultaneously to get the values of C and D
then sub back into one of the original equations to get the value of M.

See if you can do it now. Tell you what answer you get or tell me where you get stuck.
Melody.

MelodyDec 26, 2013

#29

+118725

Random260:
So typed in calculator wrong. Answer 806

500(1+(0.08/12))^ (6*12 )

Better still $806.75

Well,you actually left an important set of brackets out of the equation.
You put it into your calculator exactly as you wrote it so the real problem was that you wrote it down wrong.

Still, I think that you deserve a reward for getting it right.
I know that you are not a little kid, but I am!
kangaroo, frill neck lizzard and kookaburra.JPG

There is a couple of things I want to mention.
1.
(1+(0.08/12)) = (1+0.08/12) because you and the calculator both know that division is done before addition.
It doesn't matter that you have put the brackets in, I put the extra brackets in when I was showing you because I wanted to really stress the order.
Leave them in or take them out. It doesn't matter the answer is the same.

2.
Do you understand that your first answer was much too big and it basically had to be wrong? Would you like me to discuss this more. You might get a better feel for this sort of check as you do more examples. But maybe I can help you understand. It is up to you.

3.
Do you want another one or have you had enough now?

Cheers,
Melody.

MelodyDec 26, 2013

#28

So typed in calculator wrong. Answer 806

GuestDec 26, 2013

#27

+118725

Sorry, You'll have to try again.

MelodyDec 26, 2013

+330

That's funny! and great! Snarking your own post.

Christmas is celebrated twice a year: January 6 is the other day (Known as Twelfth-Day in some cultures).
So another opportunity will present itself shortly. It's still Christmas where I am, so Merry Christmas and Happy New Year.

Your video suggestion was great. Here's a list of the music excrepts.

The aria "L'Amour est un oiseau rebelle" (Love is a rebellious bird) from Georges Bizet's 1875 opera, Carmen.
"Dance of the Sugar Plum Fairy" from Pyotr Tchaikovsky's "The Nutcracker" 1892
"Infernal Galop" from Offenbach's 1858 operetta "Orpheus in the Underworld" (Often, erroneously referenced as the "Can Can")
(Overture) from Gioacchino Rossini's 1816 opera buffa "The Barber of Seville"
"Trepak" from Pyotr Tchaikovsky's "The Nutcracker" 1892

~~D~~

DavidQDDec 26, 2013

+118725

Max Giddings:
: What is the current population of the planet earth.

I think that you should Google it.
or look it up in whatever search engine that you use.
And then you should tell us what the answer is!

Have fun.

MelodyDec 26, 2013

#26

$6244 - 500 = How much he got in investment

GuestDec 26, 2013

+118725

bubacarr:
1(3536)kjbfkc568/*bdj

I know that this is a snark question. That is a new word that David taught me. But I'd be happy to play the game and answer it anyway.
but
I can't because you can't have a /* together like that. It doesn't make sense.

MelodyDec 26, 2013

#25

+118725

Random260:
Seems simple. R= 0.08/12 = 0.00666667
n= 12x6 =72
500(1+(0.08/12))^6*12 = 6244

----------------------------------------------------------------------------------------------------------
Okay random,
your r and n are correct. Good work.

Now think about your answer. You should always do that.
You invested 500 at 8%pa for 6 years.
Do you really think that you could end up with $6244. That's more than 12 times more than you started with or more than1200% what you started with.
does this seem right to you?? That is a serious question. If your serious answer is "I don't know" then I should talk with you more about that.

You put the numbers in the right places but you did do something wrong. Can you find your error?

Happy calculations
Melody.

MelodyDec 26, 2013

+118725

MelodyDec 26, 2013

Dec 25, 2013

+118725

Hi Kazem,

gamma(608.41) = 5.13858.. x 10 ¹⁴²⁸
This is the short answer

131226 Wolfram gamma.JPG

For mor explanation you could go here.
http://www.wolframalpha.com/input/?i=gamma%28608.41%29%3D&x=-1283&y=-148

MelodyDec 25, 2013

#24

Seems simple. R= 0.08/12 = 0.00666667
n= 12x6 =72
500(1+(0.08/12))^6*12 = 6244

GuestDec 25, 2013

Simple 2.

Rickey65Dec 25, 2013

+118725

The log in problem that I was having has been fixed (must have been a Christmas present) so now I can say Merry Christmas properly.

I hope you all have a really great Christmas!

This is a little Christmas clip that I enjoyed - maybe you will too.
There are others on the site that you may also enjoy.

http://www.youtube.com/watch?v=8LZpBjnOMYY

Melody.

MelodyDec 25, 2013

Dec 24, 2013

#23

Thanks for your dedication I will do asap.

GuestDec 24, 2013

(ln (22574) +7) / 3 = 5.6748513601718572

GuestDec 24, 2013

Why can't you do it opn your calculator?
Is there meant to be any brackets?

GuestDec 24, 2013

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