1. What is the recursive rule for the geometric sequence 10, −80, 640, −5120, …?
2. The explicit rule for a sequence is given: an = 1/2(4/3)^(n − 1)
What is the recursive rule for the geometric sequence?
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Thank you to anyone who helps!
1. 10 -80 640 -5120
an = 10 (-8)n-1
2. (1/2)(4/3) n-1
a1 = (1/2), an = (4/3)an-1
+105 
