28. A student suggests that she can show (-1)(-1) = 1 using the fact that -(-1) = 1. Is her reasoning correct? If yes, what
result will she apply? If not, why not?

What could explain what happened when the time was equal to 120 minutes

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.

Arectangle plot measure 20ft. by 30ft. a 3-ft.-wide sidewalk surrounds it. find the area of the sidewalk.