(a) Draw the influence lines for reactions RB, RD and   RF  of the beam in Figure P8.5 and...

(a) Draw the influence lines for reactions RB, RD and   RF  of the beam in Figure P8.5 and the shear and moment  at E. ( b) Assuming that the span can be loaded with a 1.2 kips/ft uniform load of variable length, determine the maximum positive and negative values of the reactions.