The graphs show the percentage of high school seniors who had ever used alcohol or marijuana. The data can be described by the following mathematical models, where n is the number of years after 1990, A is the percentage of seniors using alcohol, and M is the percentage of seniors using marijuana. A= -0.9n+56 M= -0.5n+ 31 Percentage Alcohol and Marijuana Use by High School Seniors 80- 705 60- 50- 40- 30- 20- 10- 0- 1990 1995 2000 2005 2010 2015 2019 Year a. Use the appropriate line graph to estimate the percentage of seniors who had ever used marijuana in 2019. Alcohol Marijuana

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