If ABC is reflected across the yaxis, what are the coordinates of A?

Use the graph of the sine function y=2sinθ shown below

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.

The slope of the line whose equation is 3y = 2x - 3 is 2 2/3 3/2