Multiplying or dividing two related quantities by the same number is called

What is the range of this function? all real numbers such that y ≤ 40 all real numbers such that y ≥ 0 all real numbers such that 0 ≤ y ≤ 40 all real numbers such that 37.75 ≤ y ≤ 40

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

What is an alternate exterior angle