Algebraic Properties of Limits Practice Test

A concentration is $k(x)=\dfrac{x^2-4x+1}{x}$; find $\lim_{x\to 5} k(x)$.

As $t$ approaches $2$ seconds, the sensor output is $S(t)=3t^2-5t+4$; find $\lim_{t\to 2} S(t)$.