What linear equation would best represent a trend line for the data in the scatterplot?

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.

How many ordered pairs of positive integers satisfy xy=32?

Which number line correctly shows 0.8 + 0.3?