Stopping Distance on Glare Ice. 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 D(F) is the stopping distance, in feet, when the air temperature is F, in degrees Fahrenheit.
a) Find D(0°), D(− 20°), D(10°), and D(32°).
b) Explain why the domain should be restricted to [− 57.5°, 32°].
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