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 from 1982. The model is of the form f(x)= mx+b. The letter m signifies the slope of rate of change. Rate of change is equal to $____ billoon per__. The letter b signifies the y-intercept or initial sales. The initial sales are $_____ billion for the year____.

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