Personal Income Personal Income Year ($ billions) Year ($ billions) 1990 4847 2008 12,239 2000 8559 2009 12,026 2004 9937 2010 12,429 2005 10,486 2011 13,202 2006 11,268 2012 13,888 2007 11,894 2013 14,167
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.
Personal Income The income received by people
from all sources minus their personal contributions
for Social Security insurance is called personal
income. The table lists the personal income, in billions of dollars, of people living in the United States
for the indicated years.
a. Using an input equal to the number of years after
1980, find a quadratic function that models these
data.
b. Use your unrounded model to estimate when after
1980 the personal income was $9500 billion.
c. When does the model estimate that the personal
income will be double its 2009 value?
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