According to the graph, over which segments is the car's speed changing? Speed of a Car
d
30
b
20
Speed (m/s)
a
10
0
10
20
30
40
Time (s)

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.