Graph f(t)=4.1 if 0<=t<5; -0.03t+4.25 if 5<=t<15; -0.075t+4.925 if 15<=t<=35

$f (t) = {\begin{cases} 4.1 & 0 \leq t < 5 \\ - 0.03 t + 4.25 & 5 \leq t < 15 \\ - 0.075 t + 4.925 & 15 \leq t \leq 35 \end{cases}$

Graph.

$f (t) = {\begin{cases} 4.1 & 0 \leq t < 5 \\ - 0.03 t + 4.25 & 5 \leq t < 15 \\ - 0.075 t + 4.925 & 15 \leq t \leq 35 \end{cases}$