Linear Regression Models Practice Test

A streaming service sampled 20 users and recorded age ($x$, years, from 13 to 62) and average hours streamed per week ($y$). A scatterplot with the least-squares regression line is shown, with fitted equation $\hat{y}=18.0-0.15x$. The purpose of the linear model is to describe the linear association and predict typical weekly streaming time from age within the observed range. Which interpretation of the model is correct?

A botanist measured the amount of fertilizer applied to a plot ($x$, in grams) and the plant height after 6 weeks ($y$, in centimeters) for 9 plots, with fertilizer amounts ranging from 0 to 40 grams. A least-squares regression line is $$\hat{y} = 12.4 + 0.48x$$. The purpose of this linear model is to summarize the linear association and predict typical plant height for fertilizer amounts within the observed range. Which interpretation of the model is correct?