3 years ago

What formula is required

Mathematics

1 answer:

Yuliya22 [10]3 years ago

8 0

The formula required is tangent

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Find S25 for (-7) + (-2) + 3 + 8 +...

elena-14-01-66 [18.8K]

$a_1=-7 \\ a_2=-2 \\ \\ d=a_2-a_1=-2-(-7)=5 \\ \\ \\ S_{25}= \cfrac{2(-7)+(25-1)5}{2}\cdot25 = \cfrac{-14+120}{2}\cdot25 =\cfrac{106}{2}\cdot25 =1325$

Your answer is B. 1325

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