---
# System prepended metadata

title: title

---

# title 
\begin{align}
    S(x)=\begin{cases}
    -4x+31             &\qquad \text{if} \quad 0\le x \le 12 \\
    295                &\qquad \text{if} \quad 12<  x \le 20 \\
    \frac{3}{4}x+278.5 &\qquad \text{if} \quad 20<  x \le 30 \\
    \frac{3}{2}x+404   &\qquad \text{if} \quad 30<  x  <  40 \\
    \end{cases}
 \end{align}
 
{%youtube pG8T8QQnNq8 %}


