Alcohol and Marijuana Use by United States High School Seniors 100% 90% 80% Alcohol 70% 60% 50% 40% 30% Mari juana 20% 10% 1990 1995 2000 2005 2010 2014 Year Perentage of High School Seniors Percentage of seniors using alcohol A = -0.9n + 88 Number of years after 1990 Percentage of seniors us ing marijuana M = 0.1n + 43.
The graphs show the percentage of high school seniors who had
ever used alcohol or marijuana.
a. Use the line graph to estimate the percentage of seniors who used marijuana in 2010.
b. Use the formula to determine the percentage of seniors who used marijuana in 2010. How does this compare with your estimate in part(a)?
c. Use the line graph to estimate the percentage of seniors who used alcohol in 2010.
d. Use the formula to determine the percentage of seniors who used alcohol in 2010. How does this compare with your estimate in part (c)?
e. For the period from 1990 through 2014, in which year was marijuana use by seniors at a maximum? Estimate the percentage of seniors who used marijuana in that year.
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