Identify the property or rule shown by each equation 6×8=8×6

The sum of two numbers is 86, and their difference is 20. find the two numbers

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)