"The function y = –0.78x + 95 models the data in the table. Which is the best prediction for the number of minutes of exercising Sam will do if she spends 30 minutes watching television that day?"
Just substitute 30 for x in the given function: f(30)= -0.78(30)+ 95.
71.6. She will exercise for about 72 minues on that day.
