PANEN POINT tolong bantuannya. dikumpulkan sekarang

23
[tex]\begin{array}{rcl}f(x)&=&3x^{-\frac{2}{3}}\\f'(x)&=&\left(-\frac{2}{3}\right)\times 3x^{-\frac{2}{3}-1}\\&=&-2x^{-\frac{5}{3}}\\&=&-\frac{2}{\sqrt[3]{x^5}}\end{array}[/tex]

24
[tex]\begin{array}{rcl}h(t)&<&800\\60t-t^2&<&800\\t^2-60t+800&>&0\\(t-40)(t-20)&>&0\end{array}\\\\\begin{array}{rcl}0&\leq &t&<&20\\&t&>&60\end{array}[/tex]