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zhenek [66]
3 years ago
15

Find the sum of the first 13 terms in the series -5+1+7...+67

Mathematics
1 answer:
valentinak56 [21]3 years ago
5 0
This is an arithmetic series with common difference 6 

S13  = (13/2)[2*-5 + (13-1)*6)]  =  403
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We basically have this triangle set up: 
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Pythagoreans theorem: 
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8%5E2%2Bx%5E2=12%5E2 Plug in a=8, b=x, and c=12. Now lets solve for x 

6+4+%2B++x++%5E+2+=+1+4+4 Square each individual term 
 


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Which approximates to... x+=+8+.+9+4+4+2+7+1+9+0+9+9+9+9+1+6 
So our answer is x+=+8+.+9+4+4+2+7+1+9+0+9+9+9+9+1+6....
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4 years ago
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Answer:

3-\frac{b}{3}

Step-by-step explanation:

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