help would be appreciated thank you for your time! AP statistics

2. The following graph is a residual plot derived from a scatterplot that predicted the height of girls from their ages (in years). 4 a. What does the residual plot tell you about using a linear regression model of girls' height vs age? Answer: b. Based on the pattern in the residual plot, what is the specific risk of using the regression equation to predict heights of girls ages 9-12? c. Would these predictions be too low or too high