Clarice was multiplying the numbers 6.45 x 105 and 2.8 x 107. Her incomplete work is shown. Complete the steps in Clarice's work. (6.45 × 105) (2.8 × 107) Step 1:(6.45 x 2.8) [DROP DOWN 1] Step 2: [DROP DOWN 2] x [DROP DOWN 3] Step 3: [DROP DOWN 4]​