Answer:
D) Acceleration is positive and increasing.
Step-by-step explanation:
In formulae, acceleration is defined as the rate of change of velocity per unit time; for example:

where Δ V is the variation of velocity and Δ T is the variation in time. 
The graph depicts the velocity of a moving item as a function of time. As we can see ΔV is the increment on the y-axis, while ΔT is the increment on the x axis: therefore, the ratio ΔV/ΔT is the curve's slope. In fact, the slope of the curve in a velocity-time graph corresponds to the object's acceleration. In this graph, we can see that the slope of the curve is growing, which means that the acceleration is positive (since the slope is positive and the velocity is increasing) and increasing (because the slope is increasing).
 
        
             
        
        
        
Answer:
4
Step-by-step explanation:
The slope is 4 because the x part of the equation is the slope.
 
        
             
        
        
        
Answer:
lengthXwidthXhight
Step-by-step explanation:
mark brainliest pls :)
 
        
             
        
        
        
Change in altitude:
42,000 - 18,000 = 24,000 feet
Rate of change  = 24,000 feet / 12 minutes = 2,000 feet per minute
Because the plane was going down, the rate of change would be negative.
 The rate would be -2,000 feet per minute.