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July 4, 2015

Homework Help: MATH HELP Calculus

Posted by Anonymous on Sunday, September 18, 2011 at 7:53pm.

Im stuck on a lot of questions, here they are:

24 + 12 + 6 + ...(S7)
Sn = 24(2^7-1)/2-1
S7 = 24(127)/1
S7 = 3048/1

Thats what I got as an answer, but it's wrong, the real answer is a fraction answer, and its 381/8. How did they get that???

The other one was:

512 + (-256) + 128 +... +(-1)
Sn = -2(-1)-512/-2-1
= -510/-3

This answer is somehow wrong too:/

And the other one:

-8 -2 -1/2...-1/128

Sn = 4(-1/128)-8/4-1
Sn = 4/1 * 128/1 = 512 *-8
Sn = -4096/3
= This is also the wrong answer. Im soo confused ://// It's supposed to be 1356/128

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