Need algebra help with the terms in the 1st sum that are consecutive terms of an arithmetic sequence

Algebra
Tutor: None Selected Time limit: 1 Day

Nov 29th, 2015

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a. S= n/2{2a+(n-1)d}. Here d= - 4, a=7.  We know -369=a+(n-1)d. So n=(-369-7)/(-4) +1=95. So s=95/2{14+(94)*(-4)}=-17195

b. Sum is, S=-2*148*(148+1)/2+3*148=-21608

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Nov 29th, 2015

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