Can somebody help me with this calculus problem? If you could that would be much appreciated! Thank you. (100 points)

#a
-2<0
[tex]\\ \sf\longmapsto f(x)=x^2[/tex]
[tex]\\ \sf\longmapsto f(-2)[/tex]
[tex]\\ \sf\longmapsto (-2)^2[/tex]
[tex]\\ \sf\longmapsto 4[/tex]
#b
0=0
[tex]\\ \sf\longmapsto f(x)=2[/tex]
[tex]\\ \sf\longmapsto f(0)=2[/tex]
#c
2>0
[tex]\\ \sf\longmapsto f(x)=2x+1[/tex]
[tex]\\ \sf\longmapsto f(2)[/tex]
[tex]\\ \sf\longmapsto 2(2)+1[/tex]
[tex]\\ \sf\longmapsto 4+1[/tex]
[tex]\\ \sf\longmapsto 5[/tex]