Please slove question1 , 3 and 12.

1. Are there different answers for lim (3 + x), lim 3 + x, and lim (x + 3)? x-2 x-2 x-2 2. How do you find the limit of a rational function? 3. Once you know lim f(x) and lim f(x), do you then know lim f(x)? x->a - x-a x- a Give reasons for your answer.12. Show, using the properties of limits, that if lim f(x) = 3, then lim x2 - 4 x- 5 x- 5 f(x) = 7