someone help me in reviewing my mathematics subjects especially lower mathematics

 

someone help me in reviewing my mathematics subjects especially lower mathematics

What are we talking about here? Arithmetic? Algebra? Analysis? Calculus?

-blazed

 

1+1=2
1+2=3
1+3= (Umm, I'll get back to you after I research this one a bit..)

 

1+3= (Umm, I'll get back to you after I research this one a bit..)

I figured it out: 1+3=3+1

 

But what is it in metric?