The answer is 4. Here's how I did it:
-17-(-21)=4
Two negatives make a positive. -(-21) is a double negative, so it becomes -17+22.
-17+22= 4
-22
17 out of 22 is 77.27%
5
The GCF is 1.
39
The LCM of 17 and 22 is 374
17 goes into 22 once and leaves a remainder of 5
The LCM is 374.
It is: (17/22)*100 = 77.3% rounded to the nearest tenth
17+5=22 17-5= 12
17 + 5 = 22 17 - 5 = 12
17 times 100 divided by 22, ie 77.27%