(a)
At traveled distance zero at time 28 min. the graph is represent distance of recreation center at any time "t"
(b)
Y-intercept of the graph is 9.
(c)
Rate of change is:
Where,
(d)
Rate of change represent : rate of change represent is change in y -axis in per unit change in x- axis
( e)
f(16) that mean at x=16 then y is 4.