Question

Find Sn for the given geometric series

a1=0.25, a5=446.265625, r=6.5

Answer 1

common ratio r = 4th root (446.265625 / 0.25) = 6.5

Sn = 0.25 * 6.5^n - 1
--------
6.5 - 1

Answer 2

r = 4th root as a5 = a1r^4

Answer 3

and, of course , a1 r^4 / a1 = r^4

Answer 4

ok?

Answer 5

thanks for the help joey

Answer 6

yw