Given the Formula $S = \frac { n } { 2 } ( a + l ) , S = 629 , n = 27 , l = 29$

Multiple Choice

Given the formula: $S = \frac { n } { 2 } ( a + l ) , S = 629 , n = 27 , l = 29$ Find a.

A) $a = \frac { n - l } { 2 S } = 0.064$
B) $a = \frac { 2 S } { n } - l = 18$
C) $a = \frac { S } { n } - 2 l = 16$
D) $a = \frac { n - l } { 2 S } = 0.057$
E) $a = \frac { S } { 2 n } - l = 17$