4c + 1 equals 10 what does c represent?pop art for comic books and a soda for $1 total came to $10 $10 then wrote the equation for C + 1 equals 10 what does C represent ​

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.