I need help with an algebra problem

Algebra
Tutor: None Selected Time limit: 1 Day

Nov 30th, 2015

Thank you for the opportunity to help you with your question!

a)We have the sequence as 

5(1+.5+.5^2+.5^3+.5^4+.5^5)

Here the sequence is in geometric progression with common ratio =.5

The first term is 1

So

 =155/16 (as a fraction)

b)The term here are can be found out by substituting the value of j=1,2,...9

-4,-4^2,-4^3

So the sum =>-4+(-4)^2+(-4)^3+-------(-4)^9

  So here the first term is -4 and total number of term =9

Common ratio,r=-4


Please rate my answer so that I can further help you in the future.Thanks
Nov 30th, 2015

I am being told that the 1st sum, 155/16  is wrong

Nov 30th, 2015

correct answer was  315/32

Nov 30th, 2015

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