Write an expression that equals 40 include the exponent

Ill mark the brainliest if you me with the these three questions 7,8,9

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.

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose