What do B equal?
4b + 6 = 2 – b + 4

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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.

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?