Melody

7.3 billion to 30,000

7.3*10^9   :    3*10^4

7.3*10^5  :  3

73,000 : 3

or I suppose you could write it as 

\(24,333.\bar{3}\;:\;1\)

3100.0 x 10^2 how many signifigaint digits are in this 

I think 5 are significant.  

What do you think Rom ?

24:3(2-2x)

divide both by 3

8:2-2x

factoise the right side

8 : 2(1-x)

divide by 2

4:1-x

This is the most simple answer

You forgot the minus sign in your simplification  :(((

8y^3-20y^2

\(\;\;\;\;8y^3\qquad-\qquad20y^2\\ =4y^2*2y\;\;\;-\;\;\;4y^2*5\\ The\;highest\;commom\;factor\;is\;4y^2\\ Factorised\;it\;becomes\;\;\;4y^2(2y-5)\)

Why don't you become a member,  I like the way your brain is working, and we will often answer member questions before we answer guest questions.  Members get a slightly better deal and you will be able to use the private messaging too :))

i think i understand, but 5/8 is 5 divided by 8, not 8 divided by 5

----------

Yes this is true and it is another very common source of confusion.

5 divided by 8 means how many times does 8 go into 5.

When you set it up as a long or short division like I did, the order has to be swapped around.

Maybe think of some other examples and it might help.

14 marbles divide between 2 children is 7 marbles each.      14/2=7

If you do this as short division. The number that you are dividing by must go out the front.

The 2 goes out the front and the 14 goes inside.  See the order is swapped around ://

       7

    ____

2 | 14

YES I know, maths is confusing.    :)))

Hi,

Yes, we are real people and if you are lucky you will get a real answer.

BUT 

You have to ask a real question first :))

\(\displaystyle\lim_{x\rightarrow ??} \frac{ \frac{1}{(x+4)}-\frac{1}{4} }{ x}\)

OK Is this what you want and what does x approach ???

\(\sqrt{3v^7w}\sqrt{15v^6w^2}\\ =\sqrt{3v^7w*15v^6w^2}\\ =\sqrt{45v^{13}w^3}\\ =\sqrt{9*5v^{13}w^3}\\ =3\sqrt{5v^{13}w^3}\\\)

That is probably the simplest answer.  :/