If the nth partial sum of a sequence an is given by
(will attach in a sec!!)

then what does an equal?


a. 8 + 14 + 20 + 26 + ... + 6n + 2

b. 6n + 2

c. 8 + 10 + 12 + 6n + 2

d. 6n
*** please explain cuz i don't understand this AT ALL! :(