Age of U.S. Drivers and Fatal Crashes 17.7 18 16.3 15 12 9.5 9. 8.0 6.2 4.1 2.8 2.4 3.8 3.0 3 16 18 20 25 35 45 55 65 75 79 Age of Drivers Fatal Crashes per 100 Million Miles Driven
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 bar graph shows the number of fatal vehicle crashes per 100 million miles driven for drivers of various age groups. 25-year-old drivers are involved in 4.1 fatal crashes per 100 million miles driven. Thus,
when a group of 25-year-old Americans have driven a total of 100 million miles, approximately 4 have been in accidents in which someone died.The number of fatal vehicle crashes per 100 million miles, y, for drivers of age x can be modeled by the formula
y = 0.013x2 - 1.19x + 28.24.
Use the formula above and the bar graph. What age groups are expected to be involved in 3 fatal crashes per 100 million miles driven? How well does the formula model the trend in the actual data shown in the bar
graph?
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