Question

Consider the graph of the function -x^2 - x + 6
(a) Find the equation of the secant line joining the points (-2,4) and (2,0).
(b) Use the Mean Value Theorem to determine a point in the interval such that the tangent line at is parallel to the secant line.
(c) Find the equation of the tangent line through "c"
(d) Then use a graphing utility to graph the secant line, and the tangent line. (don't worry about this one obviously)
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a) (0 - 4) / (2 + 2) = -1 (slope of secant line)
Beyond that, I don't really know.

Please help?