When Marcia was born, she weighed 8 pounds. When she was 4 months old, she weighed 10 pounds. At 8 months, she weighed 20 pounds. What is the average rate of change

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8+10+20=38    38 divided by 3 is 12.7  so if I am right the answer is 12.7. but I may be wrong the months make it confusing.