Perry has 81 red balls, which she wants to arrange in rows. if the number of balls in each row must be equal to the number of rows, how many balls must there be in a row?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

This is so hard and it’s for a test

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.