Question

Which of the following is the algebraic expression that best describes the sequence 7, 14, 21, 28, …?

Answer 1

well... what's the "common difference"?

Answer 2

7x i thnk?????????

Answer 3

well... 7
no "x" though

\(\large a_{\color{brown}{ n}}=a_1+({\color{brown}{ n}}-1)d\quad
\begin{cases}
a_1=\textit{1st term}\\
d=\textit{common difference}
\end{cases}\)