Ineed to calculate a coefficient of linear expansion given the following
change of length, feet of orginal length, and change of temp of one degree fahrenheit

The coefficient of linear expansion is

     (change of length, feet) / (original length, feet) per °F.

Since the numerator and denominator of the fraction have the same
unit, the coefficient turns out to be just a number, with no unit.

Answerwavelength;