Let $f(x) = x^2 - 5 x$.

(A) Find the slope of the secant line joining $(-5, f(-5))$ and $(-3, f(-3))$.

Slope of secant line =

(B) Find the slope of the secant line joining $(5, f(5))$ and $(5 + h, f(5 + h))$.

Slope of secant line =

(C) Find the slope of the tangent line at $(5, f(5))$.

Slope of tangent line =

(D) Find the equation of the tangent line at $(5, f(5))$.

$y =$