a. Use the appropriate line graph to estimate the percentage of seniors who used alcohol in 2014.

b. Use the appropriate formula to determine the percentage of seniors who used alcohol in 2014. How does this compare with your estimate in part (a)?

c. Use the appropriate line graph to estimate the percentage of seniors who used marijuana in 2014.

d. Use the appropriate formula to determine the percentage of seniors who used marijuana in 2014. How does this compare with your estimate in part (c)?

e. For the period from 1990 through 2014, in which year was alcohol use by seniors at a maximum? What percentage of seniors used alcohol in that year.

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The graphs show the percentage of high school seniors who had ever used alcohol or marijuana. Percentage of High School Seniors 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% Alcohol and Marijuana Use by United States High School Seniors 1990 1995 Percentage of seniors using aloohol Marijuana Percentage of seniors using marijuana Alcohol Source: University of Michigan Institute for Social Research The data can be described by the following mathematical models: 2000 2005 2010 2014 Year A = -0.9n +88 Number of years after 1990 M = 0.1n + 43.