2. Use D'Alembert's method to solve: Ofw = 0.250-w, Orw(0, t) = Orw(1, t) = 0, w(r,0) = x-r, Qw(x, 0) = 0. Determine w(x, t) for the following points: (x, t) = (0.7,2), (x, t) = (0.5, 2.2) and (x, t) = (0.1, 1.8). 3. Use D'Alembert's method to solve: Orw(0, t) = axw(2, t) = 0, w(x,0) = x-r', atw(x, 0) = 0. Determine w(x, t) for the following points: (x, t) = (0.5, 1), (x, t) = (0.5, 2) and (x, t) = (0.1, 3)