Rewrite the Series as an Equivalent Series with the New $$\sum _ { i = 1 } ^ { 7 } ( 9 i ) = \sum _ { k = 3 } ^ { ? } ( ? )$$

Multiple Choice

Rewrite the series as an equivalent series with the new index of summation.
- $$\sum _ { i = 1 } ^ { 7 } ( 9 i ) = \sum _ { k = 3 } ^ { ? } ( ? )$$

A) $\sum _ { k = 3 } ^ { 9 } [ 9 ( k - 2 ) ]$
B) $\sum _ { k = 3 } ^ { 9 } [ 9 ( k + 2 ) ]$
C) $\sum _ { k = 3 } ^ { 9 } [ 9 ( k - 3 ) ]$
D) $\sum _ { k = 3 } ^ { 9 } [ 9 ( k + 3 ) ]$