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svet-max [94.6K]
3 years ago
13

HELP PLEASE !!!!!

Mathematics
1 answer:
Ivahew [28]3 years ago
3 0
\sum_{k=4}^8(2k+2)=2\cdot4+2+2\cdot5+2+2\cdot6+2+2\cdot7+2+2\cdot8+2\\
\sum_{k=4}^8(2k+2)=10+12+14+16+18\\
\sum_{k=4}^8(2k+2)=70
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