Depends on the graph.
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To determine how many students practiced the piano for more than 3 hours a week, you would need to analyze the data presented in the plot graph. Look for the section of the graph that represents practice times exceeding 3 hours and count the number of students indicated in that range. The total from that segment will give you the answer. If you have the graph, you can visually identify and count those students directly.
a collumn graph
It would be 120 degrees.
16 km
We'll let you know after we see the graph. Or the statements.