Units are important in engineering and science, so I need to get my students to be religious about using them. I provide answers to homework and exams using Mathematica. Incorporating units in simple computations is relatively easy, but I have difficulty in using units with functions. For example how do I define a function
d[t_]:=10*t^2 + 5*t+25
where the units of t are seconds? In subsequent calls of the function, do I need to use the Quantity notation for every specific numeric value of t?
