Find the Associated Exponential Decay Model $Q = 7,000$ When $t = 0$

Multiple Choice

Find the associated exponential decay model. $Q = 7,000$ when $t = 0$ ; Half-life = 9

A) $Q = 7,000 - e ^ { - \frac { t } { 9 } }$
B) $Q = 7,000 e ^ { - \frac { t ( \ln 2 ) } { 9 } }$
C) $Q = 7,000 + e ^ { \frac { t ( \ln 2 ) } { 9 } }$
D) $Q = 7,000 e ^ { - \frac { t } { 9 } }$
E) $Q = 7,000 e ^ { \frac { t } { 9 } }$