when ryan was born, he weighed 7 pounds. at 6 months, he weighed 11.2 pounds. amanda weighed 6 pounds when…

Explanation:

Step1: Calculate Ryan's percent increase

Percent increase formula: $\text{Percent Increase} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100%$
Ryan's old weight = 7 pounds, new weight = 11.2 pounds.
$\frac{11.2 - 7}{7} \times 100% = \frac{4.2}{7} \times 100% = 60%$

Step2: Calculate Amanda's percent increase

Amanda's old weight = 6 pounds, new weight = 12.9 pounds.
$\frac{12.9 - 6}{6} \times 100% = \frac{6.9}{6} \times 100% = 115%$

Step3: Compare the two percent increases

60% (Ryan) < 115% (Amanda), so Amanda has a greater percent increase.

Answer:

Amanda had a greater percent increase in weight. Ryan's percent increase is 60% and Amanda's is 115%.