सदस्य: Melody

MartyBob47:
:shock: No, really ... all I want is a simple calculator! That's enuff fur me!! Do you have one I can download? Help? Thanks! Martin R. Flick

I am sorry Marty, we are separate from the main site. I have never seen a downloadable calculator here but there might be one, I don't know.

Melody11 Jan 2014

+118691

*
Thanks Kitty, you gave a really good answer.

applebee303:
How would I multiply it?

-------------------------------------------------------------
First, what is the area of a rectangle if the sides are 5m and 7m ?
Hopefully you know that the area is 5 x 7 = 35m ²
I am going to use this to show you how to expand double brackets.
--------------------------------------------------------------
I am not going to do yours I am going to do
(3+x)(x+3)
I have drawn a square where the sides are 3+x units long. And i have split it up as you can see into 4 bits - 2 at the top and 2 at the bottom

Just look at the top 2 sections (both put together)
It is a rectangle with 3 on the side and x+3 on the top. The area would be 3 times (x+3) that is 3(x+3)

Now we will look at the bottom bits
Again it is a recangle. x is on othe side and x+3 is the length of the top. The area would be x(x+3)

so now we have

(3+x)(x+3) = 3(x+3) +x(x+3)
Now you can expand the 2 brackets separately and then simplify by collecting the like terms.
If you don't know how to expand the 2 brackets you might be able to use the diagram to help you.

Of course you are not ging to draw the diagram every time i would think of it like this
I'd say, I have (3+x) lots of (x+3) so that is 3 lots of (x+3) + x lots of (x+3) = 3(x+3) +x(x+3)

Now you can do your one. Write and tell us what answer you get, it would be good if you include you working.
130108 (x+3) square.JPG

Melody11 Jan 2014

+118691

Saya:
what is scientific notation? and whats the easiest way to remember it?

Good question Saya,
Scientific notation is a way of writing very big or very small numbers so that they are easier to make sense of.

eg
1) the distance of the Sun to Neptune (the outer most planet in our solar system ) is
4503000000km this is more easy to make sense of if it is written as 4.503 x 10 ⁹ km
I moved the point so that there is exactly 1 non zero digit in front of the decimal point.
The power (exponent) is nine because the decimal place moved from the very end to between the 4 and 5. It moved 9 places.
The nine is positive because the number is big.
It might not seem easier to you because you are not used to it yet, but to me the one in scientific notation is much more easily understood.

2) The width of a human hair is about 0.000018m
To write this in scientifc notation you start by putting just one digit in front of the decimal point, that is 1.8
then, since it is a tiny number, less than 1, the exponent will be negative
The decimal point has moved 5 places, to see this more clearly write down 0.000018 then starting at the decimal point, put loops over each digit until you get the new spot for the decimal point, if you have understood what I am talking about there will be 5 loops.
So in scientific notation
0.000018 = 1.8 x 10 ^-5

This is a web page that you should look at. It is interactive, so you can answer questions.
http://www.mathsisfun.com/numbers/scientific-notation.html

Happy calculations

Melody11 Jan 2014

+118691

amni:
3007540

A bit bored today, are we amni.

Melody11 Jan 2014

+118691

ksadman:
I can't solve log1.2(2)

Do you mean log 1.2 base 2 otherwise written as log ₂1.2

You use the change of base rule (and a calculator) to do this, you will find it on this web page
http://en.wikipedia.org/wiki/List_of_logarithmic_identities

Melody11 Jan 2014

+118691

BreaLadybug:
:D 1.3x10^7

do you want to change this to normal notation?
10^7 is a really big number 10,000,000 to be precise.

so when you times 1.3 by 10^7 you have to move the decimal point 7 places in the direction to make 1.3 bigger.
Now, you tell me, what is the answer.

Melody11 Jan 2014

+118691

You need to give a proper question

Melody11 Jan 2014

यूजर का नाम	Melody
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