-2835
-156
7 can be subtracted from 49 only one time.
It is 9 times when it is subtracted from 42 and until reached 0
-1064
0.58 subtracted by 7 = -6.42
7N - 4N = 24
1.5 subtracted from 8.5 is one of infinitely many possible answers.
21
7 hours subtracted by 30 minutes = -23
13
-104
141+20=161, 161/7=23. The answer is 23. It is algebra