Sunday

March 1, 2015

March 1, 2015

Posted by **Kate** on Friday, April 27, 2012 at 3:21pm.

- math -
**Damon**, Friday, April 27, 2012 at 4:59pm8 8r 8r^2

so 8 r^2 = 20

r^2 = 20/8 = 5/2

r = (5/2)^.5

so

8 8(5/2)^.5 8(5/2) 8(5/2)^1.5 8(5/2)^2

fifth term = 8(25/4) = 50

Sn = 8(1-r^n)/(1-r)

S3 = 8 (1-(2.5)^1.5)/(1 -2.5^.5)

40.65

**Answer this Question**

**Related Questions**

math - An arithmetic series has a first term 8 and third term 20. What does the ...

math - The third term of a geometric progressiom is nine times the first term.if...

Math - A certain infinite geometric series has first term 7 and sum 4. What is ...

math - A certain infinite geometric series has first term 7 and sum 4. What is ...

math - the fourth term of an arithmetic progression is equal to 3 times the ...

Math - The third term of a geometric series is 24 and the fourth term is 36. ...

Math - The sum of the first seventeen terms of an arithmetic series is 493 The ...

math - A geometric series with the first term 7 converges to 70. What does the ...

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

Math - The fifth term of an arithmetic progression is three times the second ...