Original bill $32 amount of discount 15% of 32 right and solving equations to represent the relationship showing in the bar model

Which number produces a rationale number when multiplied by 1/5

Use sigma notation to represent the following series for 9 terms.

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.