The number of students, $S$, serviced by the school system in the town of Emor, $t$ years from $2000$ can be modeled by the function $S(t)=10{,}000(1.1)^t$. The number of classrooms, $C$, in the town of Emor, $t$ years from $2000$ can be modeled by the function $C(t)=450+40t$. Let $D$ be the average number of students per classroom in Emor's school system $t$ years from $2000$. **Write a formula for $D(t)$ in terms of $S(t)$ and $C(t)$.** $\qquad D(t)=$ [[☃ expression 3]] **Write a formula for $D(t)$ in terms of $t$.** $\qquad D(t)= $ [[☃ expression 4]]