What is 68 times 12376? not really sure, not meant to be in this world for math.

Sum is 17 and their difference is 3

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.

Find the distance between the pair of points a(-1,8) and b(-8,4)