Asked by bob

the third term of a geometric sequence is 25 and the eighth term is 25/32. find a, r, and t
Answered by Reiny
ar^2 = 25
ar^7 = 25/32

divide the 2nd by the 1st:
r^5 = 25/32 รท 25 = 25/800 = 1/32
r = 1/2

in ar^2 = 25
(1/4)a = 25
a = 100

where does t come into the picture ?
Answered by bob
t(n)
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