a speed time graph shows that a car moves at 20 m/s for 15s.the cars speed then steadily decreases until it comes to a complete stop at 40 s.which of the following describes the slope of the speed time graph from 15s to 40 s

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There is no picture of graphs given but the graph can be described. The problem states that the car decreased, in a time-speed graph this would show that a diagonal line going down (\). The slope of the line is how fast the speed changes. The time interval is 40-15 = 25s and the change in speed is 0-20= -20m/s. Hence the slope is -4/5 or -0.8. 

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