Question

Please help me please

Answer 1

Observe that the sequence increases by adding three units. It's an arithmetic sequence.

Let's use the arithmetic sequence formula.

`f(n)_{}=f(1)_{}+(n-1)d`

Where, f(1) = 7, d = 3. Let's replace these values.

`\begin{gathered} f(n)=7+(n-1)\cdot3 \\ f(n)=7+3n-3 \\ f(n)=3n+4 \end{gathered}`

Hence, the answer is D.