The total of the 5 tests was 444, however the 6th test would have to be 96 in order to divide the 6 tests into a whole number 540 to get an average of 90
General steps and answers are included in image. Hope this helps even though from number 4. I am guessing you have an idea of how it works
Here is the answer i hope it helps
Absolute value makes whatever is inside positive (It actually tells how many units it is from zero and that value is positive)
so
|-22|=22