Let f(t) be the tons of fish, in millions, commercially caught t years after 1950. In the function f(t), the independent variable is f(t)t and the dependent variable is f(t)t. When f(60) = 63.7, the 60 represents 60 tons of fish60 million tons of fish60 years 60 years after 1950 and the 63.7 represents 63.7 tons of fish63.7 million tons of fish63.7 years63.7 years after 1950.
