discounting..ie....1/(1+r)^n
Nothing - both terms are interchangeable - and refer to the same area. You could say "The playground is 30 metres square" - OR - "The playground is 30 square metres"
No.
For measurement feet and foot are interchangeable - one being more colloquial than the other one. So for measurements both can be used and for distances you have to use feet only.
.5
No, they are not interchangeable.
Yes, volume and dynamics are interchangeable terms.
No they can not be used interchangeably
No
No
yes
True
The terms are interchangeable, yes.
Yes they are
Si Senorita!
no
either, the terms are effectively interchangeable.