For what value of n is |n-1|+1 equal to 0

First redefine the function:

(n-1)+1   when  n-1 ≥ 0n ≥ 1
-(n-1)+1  when n-1 < 0n < 1

then solve it:

n-1+1 = n =0  ( doesn't belong to the interval)

-n+1+1 = -n + 2 = 0,   n = 2 ( doesn't belong to the interval either)

no solution for n ∈ R

It would be around 260 feet