Where are you having trouble?
a) You plugged the given values into your graphing calculator, punched the buttons like they taught you in class, and... then what?
b) You graphed your four equations, looked at the picture showing the equations and the scatterplot, and... then what?
c) You compared the dots in the scatterplot with the line for your chosen equation, and... then what?
d) You plugged "8" in for "t" in your equation, and... then what?
Please be complete. Thank you!