In each case, identify the slope and give its meaning with the appropriate units.
(a) The function N = 3.9T − 178.8 models the number of times, N, that a cricket chirps in a minute when the temperature is T^° Celsius.
(b) The function V = 47, 500d gives the volume (V, in gallons) of molasses in the storage tank in relation to the depth (d, in feet) of the molasses.