I need help with how to do c and D ? If my work is correct for a and b

Question 36 is an open-response question. BE SURE TO ANSWER AND LABEL ALL PARTS OF THE QUESTION. Show all your work (diagrams, tables, or computations) in your Student Answer Booklet If you do the work in your head, explain in writing how you did the work. Write your answer to question 36 in the space provided in your Student Answer Booklet. 36 Livy and Zack are writing arithmetic sequences. The first three terms of Livy's sequence are shown below. 4, 7, 10, ... + 3 a. What is the common difference for Livy's sequence? Show or explain how you got your answer. b. Write an expression that can be used to find the oth term of Livy's sequence. The ath term of Zack's sequence is three times the ath term of Livy's sequence. c. What is the 5th term of Zack's sequence? Show or explain how you got your answer. d. Write an expression that represents the difference of the ath term of Zack's sequence and the ath term of Livy's sequence. common difference = 3 D = 3 a 4+3= 7 7+3: 10 50 3 common difference an = a + ( n - 1 )d an = 4+ (n- 1) (3 ) an = 3n - 1 where n= nith term