Solve the Problem $\mathrm { f } ( \mathrm { t } ) = \frac { 64,000 } { 1 + 1279 \mathrm { e } ^ { - 1.7 t } }$

Multiple Choice

Solve the problem.
-The logistic growth function $\mathrm { f } ( \mathrm { t } ) = \frac { 64,000 } { 1 + 1279 \mathrm { e } ^ { - 1.7 t } }$ models the number of people who have become ill with a particular infection $t$ weeks after its initial outbreak in a particular community. How many people were ill after 9 weeks?

A) 63,981 people
B) 64,000 people
C) 450 people
D) 65,280 people