### Home > PC3 > Chapter 13 > Lesson 13.3.4 > Problem13-145

13-145.

Ryan’s sister Karen also has a toy car where the distance traveled in feet by the car is found by the equation $d\left(t\right) = 4t^{2}$. What is the instantaneous rate of change of Karen’s toy car when $t = 5$ seconds?

$d^\prime(5)=\lim \limits_{h \to 0}\frac{d(5+h)-d(5)}{h}$