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January 25, 2015

January 25, 2015

Posted by **Embraced** on Sunday, January 15, 2012 at 7:19pm.

- Alg2 -
**Reiny**, Sunday, January 15, 2012 at 8:09pmplug in all your info into the formula

( you have extra information)

S(n) = a(r^n -1)/(r-1)

781 = a(5^5 - 1)/(5-1)

781 = a(3124/4)

781 = 781a

a = 1

check: t(5) = 1(5^4) = 625

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