h=2.35f+54.7, where hh represents the expected height in centimeters and ff represents the length of the femur in centimeters. What is the meaning of the ff-value when h=149h=149?

How do i put 3(x+7) in distributive property

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

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.