The expression f(x) - f(a) is the slope of [ Select ] C The expression f(2) - f(a) is the slope of [ Select ] C As a gets closer to a , the slope of the secant line approaches the slope of the [ Select ] of f (x) at a The rate of change of f (x ) at a is given by the slope of [ Select ] The rate of change of f ( ) at a is called the [ Select ] and is denoted by [ Select ] C