Modeling Data The table shows the numbers of cellular phone subscribers (in millions) in the United States for selected years. ( Source: CTIA-The Wireless ) Year 1995 1998 2001 2004 2007 2010 Number 34 69 128 182 255 303 (a) Use the regression capabilities of a graphing utility to find a mathematical model of the form y = at 2 + bt + c for the data. In the model, y represents the number of subscribers (in millions) and t represents the year, with t = 5 corresponding to 1995. (b) Use a graphing utility to plot the data and graph the model. Compare the data with the model. (c) Use the model to predict the number of cellular phone subscribers in the United States in the year 2020.
Modeling Data The table shows the numbers of cellular phone subscribers (in millions) in the United States for selected years. ( Source: CTIA-The Wireless ) Year 1995 1998 2001 2004 2007 2010 Number 34 69 128 182 255 303 (a) Use the regression capabilities of a graphing utility to find a mathematical model of the form y = at 2 + bt + c for the data. In the model, y represents the number of subscribers (in millions) and t represents the year, with t = 5 corresponding to 1995. (b) Use a graphing utility to plot the data and graph the model. Compare the data with the model. (c) Use the model to predict the number of cellular phone subscribers in the United States in the year 2020.
Solution Summary: The author explains how to determine a mathematical model of the form y=at2+bt+c for the data.
The table shows the numbers of cellular phone subscribers (in millions) in the United States for selected years.
(Source: CTIA-The Wireless)
Year
1995
1998
2001
2004
2007
2010
Number
34
69
128
182
255
303
(a) Use the regression capabilities of a graphing utility to find a mathematical model of the form y = at2+ bt + c for the data. In the model, y represents the number of subscribers (in millions) and t represents the year, with t = 5 corresponding to 1995.
(b) Use a graphing utility to plot the data and graph the model. Compare the data with the model.
(c) Use the model to predict the number of cellular phone subscribers in the United States in the year 2020.
Consider the following system of equations, Ax=b :
x+2y+3z - w = 2
2x4z2w = 3
-x+6y+17z7w = 0
-9x-2y+13z7w = -14
a. Find the solution to the system. Write it as a parametric equation. You can use a
computer to do the row reduction.
b. What is a geometric description of the solution? Explain how you know.
c. Write the solution in vector form?
d. What is the solution to the homogeneous system, Ax=0?
2. Find a matrix A with the following qualities
a. A is 3 x 3.
b. The matrix A is not lower triangular and is not upper triangular.
c. At least one value in each row is not a 1, 2,-1, -2, or 0
d. A is invertible.
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