Let $f(x) = x^2 + 7 x$.

(A) Find the slope of the secant line joining $(-5, f(-5))$ and $(-2, f(-2))$.

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 $(5, f(5))$.

$y =$

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