I need to find m angle E

Which graph corresponds to the function f(x) = x2 + 4x – 1?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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?