Answer:
see explanation
Step-by-step explanation:
(a)
Using the relationship
distance = speed (s) × time (t) ← speed is rate of change, then
speed = [tex]\frac{distance}{time}[/tex], thus
[tex]\frac{54}{0.75}[/tex] = 72
[tex]\frac{216}{3}[/tex] = 72
[tex]\frac{252}{3.5}[/tex] = 72
[tex]\frac{432}{6}[/tex] = 72
[tex]\frac{576}{8}[/tex] = 72
Thus rate of change is constant, hence
(b)
d = 72t ← explicit formula
