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I'll solve this line graph problem step by step.

Let me analyze the graph carefully:
- The x-axis shows years from 2010 to 2017
- The y-axis shows "Number of stamps (in tens)" - so each unit represents 10 stamps
- The red line shows Mary's stamp collection growth over time

Looking at the data points on the graph:
- 2010: approximately 5 (which means 5 × 10 = 50 stamps)
- 2011: approximately 6 (60 stamps)
- 2012: approximately 8 (80 stamps)
- 2013: approximately 9 (90 stamps)
- 2014: approximately 10 (100 stamps)
- 2015: approximately 14 (140 stamps)
- 2016: approximately 20 (200 stamps)
- 2017: approximately 25 (250 stamps)

Now let me answer each question:

Question 2: How many stamps did Mary have in her collection in 2014?
Looking at 2014 on the x-axis, the line is at 10 on the y-axis. Since the y-axis is "in tens," this means 10 × 10 = 100 stamps.

Question 3: In what year did Mary have 10 stamps in her collection?
Wait, I need to be careful here. The y-axis says "Number of stamps (in tens)." So if we're looking for 10 stamps total, that would be 1 on the y-axis (since 1 × 10 = 10). Looking at the graph, in 2010, Mary had about 5 on the y-axis = 50 stamps.

Actually, let me reconsider. If the question asks "In what year did Mary have 10 stamps?" and the scale is "in tens," then 10 stamps would be represented as 1 on the y-axis. But looking at the graph, the lowest point is around 5 in 2010, which would be 50 stamps.

Hmm, I think there might be confusion in how the question is worded. Let me re-read: "In what year did Mary have 10 stamps in her collection?"

Given the scale is "in tens," if they mean 10 stamps literally, that would be y=1, but that doesn't appear on the graph. If they mean the value "10" on the y-axis (which represents 100 stamps), that would be 2014.

But wait - maybe I'm misreading the graph. Let me look more carefully at the starting point. In 2010, the line starts at about y=5. If this represents 5 units where each unit = 10 stamps, that's 50 stamps. But maybe the graph actually shows individual stamps and the "(in tens)" label is just indicating the scale markers?

Actually, looking more carefully, I think the most reasonable interpretation is:
- The y-axis values are already the actual number of stamps
- The "(in tens)" might just indicate the scale increments

Let me reconsider with this interpretation:
- 2010: ~5 stamps
- 2014: ~10 stamps
- 2017: ~25 stamps

This makes more sense for the questions!

Question 2: How many stamps did Mary have in 2014?
Answer: 10 stamps

Question 3: In what year did Mary have 10 stamps?
Answer: 2014

Question 4: How many more stamps did Mary have in 2013 than in 2011?
- 2013: approximately 9 stamps
- 2011: approximately 6 stamps
- Difference: 9 - 6 = 3 stamps

Question 5: As time goes on, what is happening to the number of stamps in Mary's collection?
The line is going upward, so the number of stamps is increasing.

Question 6: If the trend continues, how many stamps might Mary have in the year 2018?
From 2016 to 2017, the increase was from about 20 to 25 (increase of 5).
If this trend continues, 2018 would be approximately 25 + 5 = 30 stamps.

Final Answer:
2. 10
3. 2014
4. 3
5. Increasing (or Going up)
6. 30