Question 159848
A treasure hunting team of divers is placed in a computer controlled diving cage.
 The equation d = 40/3t - 2/9t squared describes the depth d (in feet) that the
 cage will descend in t minutes.
:

A) sketch the graph of the equation d = 40/3t - 2/9t squared.
:
d = y axis; t = x axis: graph equation: y = -(2/9)x^2 + (40/3)x
:
Plot the graph for x=0 to x = 60 (10 min intervals), should look like this:
{{{ graph( 300, 200, -20, 80, -100, 250, (40/3)x-(2/9)x^2) }}}
:
B) What part of the graph represents the physical aspects of the problem?
:
Only the positive values for x & y
:
C) What is the total time of the entire diving experiment?
60 min as you can see on the graph