Roller coaster curve. I need some help with the part in red. I'm not really sure what to do.


Answer:
View Image
Explanation:
I explained everything in the other problems you asked.
[tex]f(x)=\[ \begin{cases}0.7x & x\leq 0 \\-0.0275x^2+0.7x & 0\leq x\leq 40 \\-1.5x&x>40\end{cases}\][/tex]