These are sequences where you go from term to term by adding a common difference. The sequence in the image 1, 5 , 9 has a common difference of 4 since we add 4 to the previous term. There are formula in the booklet to help you with this...To access the contents of this site, you need to take out a log in or FREE subscription. × Give us feedback Which of the following best describes your feedback? Recommend Report a problem Suggest an improvement Other Name Email address Comments