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.
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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 alcohol in 2014.
b. Use the 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 line graph to estimate the percentage of seniors who used marijuana in 2014.
d. Use the 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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