8.984 rounded to the ones

9 because the .984 makes the 8 go up too a 9.

9

8.984 is closest to 9 because the ones digit is the first before the decimal. So to round it look at the first number behind it. 0-4 rounds down while 5-9 rounds up.

4x 20 is 80 but if ther machine is broken then there is none you have to redo the test