:eek: really having touble with all that need urgent help!!!

regards,

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- May 22nd 2007, 10:22 PMcarlasaderA Level Maths part2
:eek: really having touble with all that need urgent help!!!

regards, - May 22nd 2007, 10:52 PMJhevon
1)

a geometric series is one of the form:

where a is the first term, r is the common ratio and n is the current number of the term.

a)

we are given that the second term is 80,

we are also told that the fifth term is 5.12,

since

so the first term is 200, and the common ration is

b)

For a geometric series with , the sum to infinity is given by:

So here,

c)

The sum of the first terms of a geometric series is given by

So - May 23rd 2007, 06:23 AMcarlasaderthanks
can u please help me with the rest of the homework...anyone :)

- May 27th 2007, 11:33 AMJhevon
i believe the other questions were answered in your subsequent posts