(a) For the tree shown in Figure 5.40, find the demand-weighted 1- center. (b) How large must the demand at node E become for the location of the weighted absolute 1-center to change? (Give the...

(a) For the tree shown in Figure 5.40, find the demand-weighted 1- center.

(b) How large must the demand at node E become for the location of the weighted absolute 1-center to change? (Give the smallest integer demand such that the location of the 1-center changes.)