Practice Test 5

A taxi fare is modeled by $F = 2.50d + 4$, where $F$ is the fare (in dollars) and $d$ is the distance traveled (in miles). In this function, what is the meaning of the 4?

A culture of bacteria is modeled by $N(t) = 300\cdot 2^t$, where $t$ is time in hours and $N$ is the number of bacteria. What does the 300 represent in this context?