Each element of truss structure is made out of steel (Youngs modulus for steel = 30,000 ksi) and has cross-sectional area of 10 in2. Three vertical loads are applied at nodes E, G, and I. a) Is structure stable? Is it statically determinate? If it is not statically determinate, determine its degree of statical indeterminacy? b) Determine the member forces roughly by assuming that diagonal members can't carry compressive loads.