Can someone please explain step by step of what to do

Which of the following is true for the relation f(x)=2x^2+1

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Which two undefined geometric terms always describe figures with no beginning or end?