Question

Write an algebraic expression for the verbal description. the sum of two consecutive natural numbers, the first of which is n

Answer 1

I think it may be:

n + (n + 1)

hope this helps

Answer 2

Two consecutive natural numbers would be 1 and 2, or 5 and 6, for example.

If the first number is n and the second number is n+1, then you are writing $n+(n+1)=2n+1$.