The number of cancerous cells c as a function of radiation dose r is
c = r - 4
for r (measured in rads) greater than or equal to 5, and is zero for r less than 5 (as in Section 1.2, Exercise 46). Suppose that radiation is instead measured in millirads (1 rad = 1000 millirads).
Change the units in the above functions, and compare a graph in the new units with the original units.