Answer asap! will give brainliest

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.

Factor the polynomial. b^2 + 4b + 4

What is the radius of the cone in the diagram? round your answer to the nearest whole number