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What is the multiplicative rate of change of the exponential function shown on the graph?

Which letters from the table represent like terms? a and b b and c a and d b and d

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.