1. Due to improved technology and public-service campaigns, the number of collis
ID: 3038185 • Letter: 1
Question
1. Due to improved technology and public-service campaigns, the number of collisions at highway-railroad crossings per year as declined since 1985. Let n be the number of collisions (in thousands) for the year that is t years since 1980.Use the linear model y = -0.211x + 8.06 to estimate the number of collisions in 1994.
2. Suppose a college bookstore sells 784 copies of a new (not used) textbook in 2008. Each year from 2008 to 2010, the new-textbook sales are half of the previous year’s sales (due to used-textbook sales). Let f = g(x) be the sales of copies of new textbook in the year that is x years since 2008. Find an equation of g.
3. Find an equation of the line that passes through (-2, 14) and (-6, 8).
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Explanation / Answer
y = 0.211x + 8.06
number of collisions in 1994
plug x = 14
y = 0.211(14) + 8.06
y = 11.014
number of collisions in 1994 are 11 thousand approx
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