The stopping distance (at some fixed speed) of regular tires on glare ice is a function of

Question:

The stopping distance (at some fixed speed) of regular tires on glare ice is a function of the air temperature F, in degrees Fahrenheit. This function is estimated by D(F) = 2F + 115, where D1F2 is the stopping distance, in feet, when the air temperature is F, in degrees Fahrenheit.].
(a) Graph D.
(b) Find D(0o), D(-20o), D(10o), and D(32 o).
(c) Explain why the domain should be restricted to [-57.5o, 32o].