The blue curve on the following graph shows the height of an airplane over 10 minutes of flight. The two black lines are tangent to the curve at the points indicated by A and B. 401 39 30 25 ALTITUDE (Thousands of feet) 30 15 10 5 0 0 1 2 8 0 10 TIME (Minutes) The slope of the blue curve measures the plane's rate of ascent thousands of feet per minute The unit of measurement for the slope of the curve is At point A, the slope of the curve is which means that the plane is ascending Calculating the slope, pay extra attention to the units of analysis.) at a rate of feet per minute. (Hint At point B, the slope of the blue curve is which means that the plane is (Hint: Calculating the slope, pay extra attention to the units of analysis.) at a rate of feet per minute