Melody

@@ End of Day Wrap  Sat 20/9/14   Sydney, Australia   Time 8:30 pm    ♬  

Hello all,

There have been some great answers from Heureka, Alan, Rosala, HaleyWoodall17, DragonSlayer554, Chilledz3non and NinjaDevo.  Thank you all.

It was really nice to see you back on the forum Ninja  

I have not been able to keep track of all the new people but I'd like to you all to know that you are very welcome here.  Hello to Dragon's new friend Minnie.  

Now for a couple of interest posts:

1) limits - Differentiation from first principals - Sort of.    

Sun 21/9/14

Some new ideas on continuous functions and floor notation.  (Thanks Alan, Chilledznon and Melody)

This site might help

Area=7(x+3)     units squared

I may be wrong but I think lateral area is the area of only 4 sides.  The top and bottom don't count.

You can google it and find out if I am correct.

I'm sorry I have not seen questions like these before.

I do not know the notation [[x]]       It is a mystery to me?

That is an apppoximation but thanks Dragon.  

Rosala has treated this question like a proof.

And yes Rosala if it had been presented as 'prove' your answer would be 100% correct.

It is not wrong anyway - but there is not question here.  It is just a statement.    

(I've added this because Rosala has asked me to comment further)

I  can't say much more than this.  Sorry Rosala.     

$$cx^2+2x=x^3-cx\qquad $for $ x=2$$

sub in x=2 and solve the equation for c   

$$\\4c+4=8-2c\\
6c=4\\
c=2$$