Translate the following statement into a mathematical equation: The product of four and a number, plus six, is eighteen.
4(n + 6) = 18
4n + 6 = 18
6n + 4 = 18
4 + n + 6 = 18
4(n + 6) = 18
4n + 6 = 18
6n + 4 = 18
4 + n + 6 = 18