Nolan used the following procedure to find an estimate for StartRoot 18 EndRoot. Step 1: Since 4 squared = 16 and 5 squared = 25 and 16 < 18 < 25, StartRoot 18 EndRoot is between 4 and 5. Step 2: Since 18 is closer to 16, square the tenths closer to 4. 4.1 squared = 16.81 4.2 squared = 17.64 4.3 squared = 18.49 4.4 squared = 19.36 Step 3: Since 18.49 rounds to 18, 4.3 is the best approximation for StartRoot 18 EndRoot. In which step, if any, did Nolan make an error?