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 6 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...