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1. Follow-up
a. Can the common difference be negative? If so, Describe the sequence.
b. From the previous assignment, Identify which of the following is an arithmetic sequence then find each common difference
1, 4, 7, 10,.. || 9, 12, 15, 18,...
2, -10, 50, -250,...|| 5, 10, 20, 40,...
2, 6, 10, 14,... || 3, 12, 48, 192,...
7, 12, 17, 22,... || 4, 11, 18, 25,...
1, 3, 9, 27,... || 1, 4, 16, 24,..

2. Study. Finding the nth term of an arithmetic sequence.
a. Formula to find the nth term of an arithmetic