Sunday

November 23, 2014

November 23, 2014

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

**Answer this Question**

**Related Questions**

Math(arithmetic & Geometric Series) - 1)The sum of 6 terms of an arithmetic ...

math studies - An arithmetic series has a first term of -4 and a common ...

arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...

arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...

Algebra 2 - What is the sum of a geometric series with first term a1= 2, a ...

Geometric Series (Algebra 2) - I need some assistance or a formula when trying ...

Maths - 1..The first 2 terms of a geometric progression are the same as the ...

Geometric series - The sum of the first five terms of a geometric series is 186 ...

CALC II - Determine the convergence of the following series using the nth-...

Maths - Geometric Progression - The second term of a GP is 1/2 and the sum ti ...