#### Answer

$-25$

#### Work Step by Step

$\sum ^{5}_{i=1}\left( i-8\right) =\sum ^{5}_{i=1}i-\sum ^{5}_{i=1}8=\dfrac {n\left( n+1\right) }{2}-8n=\dfrac {5\times \left( 5+1\right) }{2}-8\times 5=15-40=-25$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$-25$

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