Answer:
x denotes an unknown amount in an expression while n denotes where a term is in a sequence.
2x: a sequence goes 1,2,3 and 4 the term "n" is acertain amount.
2n: This is how they are usually used. but they can also be interchangeable if we want to use them interchangeably.x and n both means an "unknown value".
Step-by-step explanation: