Question

can some one Find the next three terms in the sequence plz

3, 12, 21, 30, . . .

Answer 1

\[a_n = 3(3n-2)\]
\[n = term~you~want\]
You know that the fourth term is 30 you want the 5, 6, 7 term then.
\[a_5 = 3(3(5)-2) \rightarrow 39\]
\[a_6 = 3(3(6)-2) \rightarrow 48\]
\[a_7 = 3(3(5)-2) \rightarrow 57\]