The graph shows the number of hours per day spent on social media by a group of teenagers and the number of hours per day spent exercising. a line of best fit for the data is shown.

use the graph to determine how many hours a teenager would spend exercising in one day if they spent 0.25 hours on social media.

use the graph to determine how many hours a teenager would spend exercising in one day if they spent 1.38 hours on social media.

do you think the predictions from part (a) and part (b) are reliable? explain your reasoning.