Question

Please HELP me with 21,22,23 and explain

Answer 1

21. The answer is 453. I put it in the calculator and got 452.5, so I rounded to 453. If it's 5 or more round up, 4 or less round down.
22. 14.1 I did the same thing it came out as 14.06, but the 6 made me round to 1.
23. $4.1 I think you get the concept now.