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marusya05 [52]
3 years ago
6

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

Mathematics
1 answer:
elena-14-01-66 [18.8K]3 years ago
3 0
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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Answer:

option c is correct.

Step-by-step explanation:

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WE need to simplify this equation.

Solve the parenthesis of each term.

=7\left\sqrt[3]{2x}\right-3\left\sqrt[3]{16x}\right-3\left\sqrt[3]{8x}\right

Now, We will find factors of the terms inside the square root

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Adding like terms we get:

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(\sqrt[3] {2}\sqrt[3]{x})-6\left(\sqrt[3]{x}\right)\\can\,\,be \,\, written\,\, as\,\,\\(\sqrt[3] {2x})-6\left(\sqrt[3]{x}\right)

So, option c is correct

5 0
3 years ago
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Step-by-step explanation:

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