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OpenStudy (anonymous):
The sixth term of a sequence is 128 and the common ratio is 2. Use the explicit formula for a geometric sequence to find the first term.
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OpenStudy (shamim):
given t6=128 r=2
OpenStudy (shamim):
we know the formula is tn=ar^(n-1)
OpenStudy (shamim):
so we can write t6=ar^(6-1)
OpenStudy (shamim):
128=a*2^(6-1)
OpenStudy (shamim):
tell me a=?
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