The two metal disks, one having radius R1 = 4.50 cm and mass M1 = 0.88 kg and the other having radius R2 = 5.96 cm and mass M2 = 2.74 kg, are welded altogether and mounted on the frictionless axis via their common center. Determine the net moment of inertia of the two disks? Provide your answer in kg*m2 in scientific notation three significant digits.