The function f(t) = 1.5t + 16.9 can be used to estimate the yearly sales of soccer equipment, in billions of dollars, as a function of time, in years, measured from 1982.
The model is of the form f(x) = mx + b. The letter m signifies the slope or rate of change.
Rate of change is equal to $____ billion per ____.
The letter b signifies the y-intercept or initial sales.
The initial sales are $_____ billion for the year ____.