Use the following information to answer the next question. For Leila, caffeine has a half-life of approximately 6 h. If Leila ingests 250 mg of caffeine, the amount of caffeine in her body over time can be modelled by the exponential function al R = 250 2 where R is the amount of caffeine in Leila's body, in milligrams, after t hours. 1. Leila no longer experiences the effects of caffeine once the amount of caffeine in her body drops to 50 mg. Explain how to graphically determine the amount of time that it would take Leila to no longer experience the effects of the caffeine ingested. [2]