Find a vector parametric equation F(t) for the line through the points P = (5,-5, -5) and Q = (10, -6, -9) for each of the given conditions on the parameter t. (a) If 7(0) = (5, -5, −5) and 7(8) = (10, -6, -9), then r(t) = (b) If 7 (5) = P and 7(9) = Q, then F(t) = (c) If the points P and Q correspond to the parameter values t = 0 and t= -2, respectively, then F(t) =

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