Kayleen left home at noon and drove to boston. she got there at 4: 00.if boston is about 280 miles away, what was kayleens average speed

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.

Simplify the following expression 48^1/2

Let x = a + bi and y = c + di and z = f + gi. which statements are true?