I need help with an algebra problem

label Algebra
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Nov 30th, 2015

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

The formula is  S = a(1-r^n)/(1-r)

in the first question r = (-4) , n= 7 and a = (-4)
so, S = (-4) (1- (-4)^7) /(1-(-4)) = -4( 1 + -16384)/ 5 = -4 *16385/5 = -4* 3277 = -13108


in the second question , r = (1/3) , n= 8 and a = 2/3

so, S = (2/3) ( 1 - (1/3)^8) / ( 1-1/3) = 2/3 ( 1 - 1/6561) / 2/13 = 1 - 1/ 6561 = 6560 / 6561

Let me know incase you need any further help ! Thanks :)
Nov 30th, 2015

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