a) Find the x-intercept (in exact form). ( ) x-intercept: , b) Find the y-intercept (in exact form). ( ) y-intercept: , Number of collisions 5. The number of collisions at highway-railroad crossing (in thousands) Year (in thousands) are shown for various years in the table to the right. 1992 4.9 1995 4.6 a) Let be the number of collisions (in thousands) at years since 1990. n t Create a scattergram of the data. Label the axes and the tickmarks. 2000 3.5 2005 3.1 2010 2.0 b) Sketch a line that comes close to the data points. 2011 2.0 c) Use your linear model from part b to estimate the number of collisions in 2015. d) Did you perform an interpolation or extrapolation in part c)? Explain. 6. The model estimates the percentage of Americans who are baseball fans, at years since 1990. P(t), t
a) Find the x-intercept (in exact form). x-intercept: ( , ) b) Find the y-intercept (in exact form). y-intercept: ( , ) Year Number of collisions (in thousands) 1992 4.9 1995 4.6 2000 3.5 2005 3.1 2010 2.0 2011 2.0 5. The number of collisions at highway-railroad crossing (in thousands) are shown for various years in the table to the right. a) Let n be the number of collisions (in thousands) at t years since 1990. Create a scattergram of the data. Label the axes and the tickmarks. b) Sketch a line that comes close to the data points. c) Use your linear model from part b to estimate the number of collisions in 2015. d) Did you perform an interpolation or extrapolation in part c)? Explain. 6. The model estimates the percentage of Americans who are baseball fans, P(t), at t years since 1990.
Exam%202%20Math142-2%20Sp2018.docx