Melody

$$\\-1-(-5x)-2x+2x^2+7\\
=-1--5x-2x+2x^2+7\\
=-1+5x-2x+2x^2+7\\
=2x^2+5x-2x+7-1\\
=2x^2+3x+6$$

$$\\\frac{\sqrt4}{2*\sqrt{64}}\\\\
\frac{2}{2*8}\\\\
\frac{1}{8}\\$$

Where are the choices?

Thanks Heureka 😃

We did this yesterday. So look through the old posts.

I think it may have bren in the end of day  wrap. 

Aww       

I suppose because they are the most natural numbers.

Like 

How many cows do you own?   The answer is a natural number.   (unless you have got none)

Counting(natural)  numbers are the obvious base unit of an number system.

8w*8w=8*8*w*w = 64w^2

Good answer anon  

NO it is subtract not multiply.

0/3-4 = 0-4 = -4