A) Below is the graph of the U.S car & trucks from 1970-2008

B) We predict that there will be 258.19 cars and trucks in the U.S in 2013.
C) We double checked our prediction in part b extending the trend line we made in part b.

D) We are confident that the prediction we made is correct because we followed the step to step direction in part b and the square value is close to one. We also double checked our prediction in part c by extending our trend line.

E)

The square value for this graph is less than the previous graph’s square value so we were less confident. The points start to decrease before it reaches the prediction we made also.
F) y=3.3152x-6419.2
Y=0
6419.2=3.3152x
6419.2/3.3152
X=1936.29
G ) The first car was invented in 1769. We weren’t accurate because the x value for the answer in part F did not match when the car was actually invented.
H) We predict from the following information in the data that there will be 381.96 Million rounding up to 382 cars and trucks in the U.S in 2050. We are pretty confident because we stretched down the cells up to the year 2050.

2)A) We added a trendline to the graph below and included the line and the r-squared value.

B) We predict that the coal consumption in the year 2013 is 25.723 rounding up to 26. Below we extended the trendline.

c) We used the equation in part b’s graph and predicted that the coal consumption will reach 30 quads in 2027.

D) Below is the 1970-2010 coal consumption data from the U.S.

E) We feel confident because the graph in B is increasing while graph D is decreasing in 2010. The social changes from this are that people have been using more coal over the years, which makes sense since industrialization has increasing worldwide. Politically, countries will compete with each other for the decreasing coal supply. This could potentially lead to conflict and