Given the following two formulas for an arithmetic sequence, which of the statements below are true?
Check all that apply.
The explicit formula:
an = a1 + (n - 1) • d
The recursive formula:
an = an-1 + d.
A. a1 is the previous term in the sequence
B. a1 is the first term in the sequence
C. an-1 is the nth term in the sequence
D. n is the index of the sequence
E. an is the previous term in the sequence