观察下表。

	A	B	C	D
第 1 行	4	5	6	7
第 2 行	8	9	10	11
第 3 行	12	13	14	15
第 $n$ 行

第 $n$ 行 C 列的代数式是什么？

1. Identify the sequence of numbers in Column C

The numbers in Column C for Row 1, Row 2, and Row 3 are $6, 10, 14, \dots$

2. Determine the pattern and find the expression for the $n$-th term

The sequence increases by a constant difference of $4$ ($10 - 6 = 4$, $14 - 10 = 4$).
The $n$-th term is given by $4n + c$.
For $n = 1$, $4(1) + c = 6 \implies c = 2$.
Thus, the expression for Row $n$ is $4n + 2$.