Tuesday

July 22, 2014

July 22, 2014

Posted by **Robo123** on Saturday, December 11, 2010 at 10:24am.

a) 85

b) 225

c) 86

d) 85/2

e) not possible

- Math - Geometric Series -
**Reiny**, Saturday, December 11, 2010 at 10:47amr = -64/128 = -1/2

a = 128

sum(8) = 128( 1 - (1/2)^8 / (1+1/2)

= 128(255/256)(2/3) = 85

- Math - Geometric Series -
**drwls**, Saturday, December 11, 2010 at 10:57amWith only 8 terms, it's easier for me to do the addition than remember the formula.

Adding in pairs, successive pairs are lower by a factor of 4.

64 + 16 + 4 + 1 = 85

- Math - Geometric Series -
**sylow theorems**, Sunday, December 12, 2010 at 10:08pm128-64+32-16+8-4+2-1=64+16+4+1=80+5=85(!)

**Related Questions**

sum geometric series - what is the sum of geometric infinite series 3/2+ 9/16+ ...

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

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

Math/Pre Cal - Find the sum of the geometric series 128-64+32-______to 8 terms .

Math/Pre Cal - Find the sum of the geometric series 128-64+32-______to 8 terms .

algebra - Can someone please help me with this problem? Thanks! Evaluate the ...

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

algebra(check) - 1)Find a1 in a geometric series for which Sn=300,r=-3,and n=4 a...

math - sorry for before it is my first time using this website and this is the ...

algebra - 1)Find a1 in a geometric series for which Sn=300,r=-3,and n=4 a.15 b....