​What is n+8

depends on what the n is

n + 8 is the most simplified form.

When n = 1

n + 8 = 1 + 8 = 9

When n = 2

n + 8 = 2 + 8 = 10.

Like this.

When n = 10000000000,  n + 8 = 10000000008 LOL