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OpenStudy (anonymous):
Find S25 for -7+ -2 + 3 + 8 +…
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OpenStudy (campbell_st):
so you are finding the sum of the first 25 terms on the arithmetic series 1st term a = -7, common difference d = 5 and number of terms n = 25 use the formula \[S_{n} = \frac{n}{2}[2a + (n -1)\times d]\] substitute and evaluate
OpenStudy (anonymous):
i got 1325
OpenStudy (campbell_st):
thats about right
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