Ingrid is docking a motorboat. She turns off the power and lets the boat coast
toward the dock. The distance,
d, in metres, between the boat and the dock as a function of
time,
t, in seconds, is given by

.
a) What is the average velocity of the boat
during the time interval from when Ingrid turns the boat off to when it meets the dock?
b)
Determine the velocity of the boat when Ingrid turns off the power, to one decimal place.
c)
Determine the velocity of the boat when it meets the dock, to one decimal place.
d)
Sketch the graph of the function. On the same set of axes, sketch the graph of the
speed of
the boat in relation to the time.