(solution) Hi. I'm having trouble with econ homework. Can anyone help me

(solution) Hi. I'm having trouble with econ homework. Can anyone help me

Hi.

I’m having trouble with econ homework. Can anyone help me with it? I’m in Econometrics class.

I attached the files. PDF is the HW and excels are information that needs to know to solve the questions.

Thanks. 

Year Cars Sold (millions)
1950
1955
1960
1965
1970
1975
1980
1985
1990
1995
2000
2005 6
7.8
7.3
10.3
10.1
10.8
11.5
15.4
13.5
15.5
17.4
16.9 % General Motors
50.2
50.4
44
49.9
39.5
43.1
44
40.1
36
31.7
28.6
26.9