### Part 1:

A dosage rate of $250$ mg/hr is reduced by $5$ mg/hour each hour.
1. Complete the table for a dosage rate reduced by $5$ mg/hour each hour.
 t (hours) Dosage (mg/hr) $0$ $1$ $2$ $3$ $4$
What is the rate of change $m$ between any two ordered pairs in the table? $m=$