#### Answer

4970

#### Work Step by Step

$$ S_{n}=2+4+6+8+...+2n\Rightarrow S_{70}=2+4+6+\ldots +140\Rightarrow a_{1}=2;a_{70}=140\Rightarrow S_{n}=\dfrac {a_{1}+a_{n}}{2}\times n\Rightarrow S_{70}=\dfrac {2+140}{2}\times 70=4970$$

Published by
Pearson

ISBN 10:
013421742X

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

4970

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