We will have the following:
a)
*1970:
[tex]f(70)=82.6(70)+12363\Rightarrow f(70)=18145[/tex]
*1990:
[tex]f(90)=-376.4(90)+48684\Rightarrow f(90)=14808[/tex]
*2030:
[tex]f(130)=-376.4(130)+48684\Rightarrow f(130)=-248[/tex]
b) We will have that the graph will be the following:
[From the scale given in the image it looks like option B], since the scale is so large.
