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LenaWriter [7]
3 years ago
8

Write the sum using summation notation, assuming the suggested pattern continues.

Mathematics
1 answer:
Andrej [43]3 years ago
4 0
Hello,
First , number of numbers: (131-(-4))/9 +1=15+1=16
 [(last number- first number)/ (2th number- 1th number) +1

\sum_{i=1}^{16}{(-13+i*9) =-13 \sum_{i=1}^{16}{1} + 9*\sum_{i=1}^{16}{i}




=-13*16+9*\frac{16*(1+16}{2}=-208+9*136=1016





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