Is the sequence $\displaystyle {a}_{{n}}={2}+{7}{n}$ arithmetic?
Your answer is (input yes or no) ;
if your answer is yes,
its first term is Preview Question 6 Part 2 of 3   .
its common difference is Preview Question 6 Part 3 of 3   .
Hint: Write out a few terms of the sequence and see if there is a common difference.