### Home > PC > Chapter 9 > Lesson 9.3.4 > Problem9-149

9-149.

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

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