Solve the Problem $t$ Seconds Is $f(t)=\frac{18}{t+1}+\frac{13}{t^{2}+1}$ Feet What Is the Instantaneous Velocity at 2 Seconds?
A)

Multiple Choice

Solve the problem.
-A particle is moving on a horizontal line. Its distance from the origin at time $t$ seconds is $f(t) =\frac{18}{t+1}+\frac{13}{t^{2}+1}$ feet. What is the instantaneous velocity at 2 seconds?

A) $-\frac{14}{5} \mathrm{ft} / \mathrm{sec}$
B) $\frac{43}{5} \mathrm{ft} / \mathrm{sec}$
C) $-\frac{70}{9} \mathrm{ft} / \mathrm{sec}$
D) $-\frac{102}{25} \mathrm{ft} / \mathrm{sec}$