Answer:
The answer is D
Step-by-step explanation:
The graph starts at 40 so you know that Gary has 40 stamps originally. At 4 weeks you can clearly see he now has 60 stamps, so he has earned 20 in 4 weeks. To find out how many stamps he earned per week you do 20/4 which equals 5. So he has 40 to start and gains 5 stamps each week after.
