Melody

Hi MathsGod1      

the \ indicates that a function follows,

then the arguments of the function must be in curly brackets  {parentheses}

The plus minus symbol is a new function for you.  It is  \pm

You should not be using any square brackets here at all.

Do you want to try and fix it and we will see how you go       You  are doing really well !

Thanks MG 

Of course I will fly to the moon with you!    

No of course they are not always good at maths

$$\sqrt[3]{216} = 216^{(1/3)}$$

216^(1/3)

$${{\mathtt{216}}}^{\left({\frac{{\mathtt{1}}}{{\mathtt{3}}}}\right)} = {\mathtt{5.999\: \!999\: \!999\: \!999\: \!999}}$$

That is rounding error - The answer is 6

if x+1<0

then 

x<-1

There are NO positive integers that will make this true!

WOW!    WOW!    WOW!

Only 42 folds.

That is incredible.   

Maybe the moon is closer than I thought   LOL

Thanks Alan     

$$2a+4b-8c=2(a+2b-4c)$$

I don't get this question.   

Thanks SoulReaper, that is a good answer   

Anon, If you are serious about understanding, this post might help.

you can try answering the questions too if you want to.   After you finish I can give you the answers.

http://web2.0calc.com/questions/positive-and-negative-numbers-directed-numbers

1) Now -3+8 Start at -3 and go 8 in the positive direction and what do you get? 
2) Now 4 - 9 start at 4 and go 9 in the negative direction and what do you get? 
3) Now -2- 8 start at -2 and go 8 in the negative direction and what do you get? 
4) 0-8= 
5) -2-+6= 
6) 1-4+(-7)= 
7) -9++4 = 
8) 13+(-5)= 
9) -4 x 6 = 
10) 3 x -6 = 
11) -5 x -3= 
12) 20 / -4= 
13) -8 / 2= 
14) -15 / -5= 
15) +4 x +7=