1. The explicit formula an = 2-5 (n-1) represents an arithmetic sequence. Write the recursive formula for the sequence.
Lesson 4: Formulas for Arithmetic Sequences
1. d
2. a,f
3. b
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1.D
2.A.F
3.B
since 5(n-1) subtracts 5 when n increases by 1,
a_n = a_(n-1) - 5
now, what is a_1 ?