PLEASEE ANSWERR IT IN MIDDLE OF TEST

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?