A letter in math can stand for any number
p= n=4
It is an expression
n will typically mean number. It can stand for any given number, and what it stands for will depend on the problem.
"Respective" means "in that order". So, for example, weights of 1 Newton, 2 N and 3 N at points p q and r respectively, menas a weight of 1 N at point p, 2 N at q and 3 N at r.
A letter in math can stand for any number
It means K C F or Keep Change Flip with fractions when multiplying E H I E A L P N P G E
The letters P N in this case stand for "prime numbers".
p= n=4
It is an expression
n will typically mean number. It can stand for any given number, and what it stands for will depend on the problem.
Five pennies in a nickel. (US coinage)
United Nations Development Programme
Seven players in a netball team.
National Association for the Advancement of Colored People N A A C P
Assuming that x represents multiplication, it is p times r times n or prn.
N plus 28 is a math equation. N would stand for an unknown number. You would add 28 to this unknown to find the answer.