Refer to the graph of y = f(x) = x"+ x shown. a) Find the slope of the secant line joining ( - 4, f( - 4)) and (0, f(0)). b) Find the slope of the secant line joining ( - 4, f( -4)) and ( - 4 + h, f( - 4 + h)). c) Find the slope of the graph at ( - 4, f( - 4)). d) Find the equation of the tangent line to the graph at ( - 4, f( - 4)). 5