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The following graph shows the weight measurements of the average infant from the time of birth (t = 0) through age 2 (t = 24). 30 12 3.5 11 6 22.5 20 7.5 Average weight of infants (in pounds) 5 7.5 - 2 4 6 8 10 12 14 16 18 20 22 24 Months By computing the slopes of the respective tangent lines, estimate the rate of change (in lb/month) of the average infant's weight when t = 3 and when t = 18. (Round your answers to one decimal place as needed.) t = 3 Ib/month t = 18 Ib/month What is the average rate of change (in lb/month) in the average infant's weight over the first year after birth? (Round your answer to one decimal place as needed.) Ib/month