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A student puts a plant in a pot filled with soil, and then he levels the soil off. He sticks a ruler in the soil, touching the bottom of the pot, and he checks each week to see the level of the soil at the top of the ruler. Using another ruler, he also measures the height of the plant each week. He gets the following results:
Dirt level
Height of plant
Week 1
18 cm
10 cm
Week 2
15 cm
Week 3
Week 4
20 cm
Week 5
21 cm
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